Sure, here is a list of common syscalls available for use in assembly code with
the GNU Assembler (GAS) on Linux systems. These syscalls are typically accessed
via the `syscall` instruction in x86_64 architecture. Note that syscall numbers
can vary by architecture and kernel version.

### Common Syscalls and Their Numbers (x86_64)

1. **`exit`**: Terminate a process
   - **Syscall Number**: 60

2. **`fork`**: Create a new process
   - **Syscall Number**: 57

3. **`read`**: Read from a file descriptor
   - **Syscall Number**: 0

4. **`write`**: Write to a file descriptor
   - **Syscall Number**: 1

5. **`open`**: Open a file
   - **Syscall Number**: 2

6. **`close`**: Close a file descriptor
   - **Syscall Number**: 3

7. **`stat`**: Get file status
   - **Syscall Number**: 4

8. **`fstat`**: Get file status (using file descriptor)
   - **Syscall Number**: 5

9. **`lstat`**: Get file status (like `stat`, but follows symlinks)
   - **Syscall Number**: 6

10. **`mmap`**: Map files or devices into memory
    - **Syscall Number**: 9

11. **`mprotect`**: Set protection on a region of memory
    - **Syscall Number**: 10

12. **`munmap`**: Unmap files or devices from memory
    - **Syscall Number**: 11

13. **`brk`**: Change data segment size
    - **Syscall Number**: 12

14. **`socket`**: Create a socket
    - **Syscall Number**: 41

15. **`connect`**: Connect a socket to an address
    - **Syscall Number**: 42

16. **`accept`**: Accept a connection on a socket
    - **Syscall Number**: 43

17. **`sendto`**: Send a message on a socket
    - **Syscall Number**: 44

18. **`recvfrom`**: Receive a message from a socket
    - **Syscall Number**: 45

19. **`sendmsg`**: Send a message on a socket
    - **Syscall Number**: 46

20. **`recvmsg`**: Receive a message from a socket
    - **Syscall Number**: 47

21. **`shutdown`**: Shut down part of a full-duplex connection
    - **Syscall Number**: 48

22. **`bind`**: Bind a name to a socket
    - **Syscall Number**: 49

23. **`listen`**: Listen for connections on a socket
    - **Syscall Number**: 50

24. **`getsockname`**: Get socket name
    - **Syscall Number**: 51

25. **`getpeername`**: Get peer name
    - **Syscall Number**: 52

26. **`socketpair`**: Create a pair of connected sockets
    - **Syscall Number**: 53

27. **`fork`**: Create a child process
    - **Syscall Number**: 57

28. **`execve`**: Execute a program
    - **Syscall Number**: 59

29. **`wait4`**: Wait for a process to change state
    - **Syscall Number**: 61

30. **`sigreturn`**: Return from a signal handler
    - **Syscall Number**: 63

31. **`setrlimit`**: Set resource limits
    - **Syscall Number**: 75

32. **`getrlimit`**: Get resource limits
    - **Syscall Number**: 76

33. **`poll`**: Poll file descriptors
    - **Syscall Number**: 7

34. **`eventfd2`**: Create an eventfd object
    - **Syscall Number**: 284

This list covers a range of common syscalls, but there are many more available
depending on the specific needs and kernel version. For a complete and
up-to-date list of syscalls and their numbers, refer to the official Linux man
pages (`man 2 syscall`) or the Linux kernel source.

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