Function sys_chdir 

pub fn sys_chdir(_abi: &mut LinuxRiscv64Abi, trapframe: &mut Trapframe) -> usize

Linux sys_chdir system call implementation (syscall 49) Change current working directory

Arguments:

• path: Path to the new working directory

Returns:

• 0 on success
• usize::MAX on error (path not found, not a directory, permission denied, etc.)