Add Vmmap to RawPOSIX

[Yaxuan-w]

Implementing VMMAP in RawPOSIX

Add current code into RawPOSIX

• [ ] Add current VMMAP implementation into RawPOSIX (each cage structure has vmmap) - @Yaxuan-w
• [x] Add comments - @ruchjoshi-nyu

Integration

Address picked by host calling vmmap, then use this addr to call kernel mmap, a function before mmap in dispatcher to check and pick addr for vmmap

• [ ] mmap / shm / munmap / brk- @qianxichen233

All translation about address should be done in dispatcher stage. Including all functions related to pointers — handle situations depends on flags

• [ ] syscall w/ ptr — a function to check if region is valid - @ruchjoshi-nyu
• [ ] fork - @qianxichen233
• [ ] exec - @ChinmayShringi
• [ ] exit - @ChinmayShringi
• [ ] consolidate constants - @ChinmayShringi

Test

• [ ] Add tests for vmmap - @ChinmayShringi

Here's the syscall with pointer list generated by @ChinmayShringi

// Uses pointers
getcwd_syscall       // getcwd_syscall(&self, buf: *mut u8, bufsize: u32) -> i32
read_syscall         // read_syscall(&self, virtual_fd: i32, readbuf: *mut u8, count: usize) -> i32
write_syscall        // write_syscall(&self, virtual_fd: i32, buf: *const u8, count: usize) -> i32
ioctl_syscall        // ioctl_syscall(&self, virtual_fd: i32, request: u64, ptrunion: *mut u8) -> i32
mmap_syscall         // mmap_syscall(&self, addr: *mut u8, len: usize, prot: i32, flags: i32, virtual_fd: i32, off: i64) -> i32
munmap_syscall       // munmap_syscall(&self, addr: *mut u8, len: usize) -> i32
getdents_syscall     // getdents_syscall(&self, virtual_fd: i32, buf: *mut u8, nbytes: u32) -> i32
send_syscall         // send_syscall(&self, virtual_fd: i32, buf: *const u8, buflen: usize, flags: i32) -> i32
sendto_syscall       // sendto_syscall(&self, virtual_fd: i32, buf: *const u8, buflen: usize, flags: i32, dest_addr: &GenSockaddr) -> i32
shmat_syscall        // shmat_syscall(&self, shmid: i32, shmaddr: *mut u8, shmflg: i32) -> i32
shmdt_syscall        // shmdt_syscall(&self, shmaddr: *mut u8) -> i32
pread_syscall        // pread_syscall(&self, virtual_fd: i32, buf: *mut u8, count: usize, offset: i64) -> i32
pwrite_syscall       // pwrite_syscall(&self, virtual_fd: i32, buf: *const u8, count: usize, offset: i64) -> i32
getifaddrs_syscall   // getifaddrs_syscall(&self, buf: *mut u8, count: usize) -> i32
writev_syscall       // writev_syscall(&self,virtual_fd: i32,iovec: *const interface::IovecStruct,iovcnt: i32,) -> i32
recv_syscall         // recv_syscall(&self, virtual_fd: i32, buf: *mut u8, buflen: usize, flags: i32) -> i32
recvfrom_syscall     // recvfrom_syscall(&self, virtual_fd: i32, buf: *mut u8, buflen: usize, flags: i32, addr: &mut Option<&mut GenSockaddr>) -> i32
getsockopt_syscall   // getsockopt_syscall(&self, virtual_fd: i32, level: i32, optname: i32, optval: *mut u8, optlen: *mut u32) -> i32
setsockopt_syscall   // setsockopt_syscall(&self, virtual_fd: i32, level: i32, optname: i32, optval: *const u8, optlen: u32) -> i32
gethostname_syscall  // gethostname_syscall(&self, name: *mut u8, len: isize) -> i32
select_syscall  
epoll_wait
poll_ctl

[rennergade]

We should double check the above list, I think things like poll pipe and socketpair all also use addresses, may be more.