Module os::syscall

Implementation of syscalls

The single entry point to all system calls, syscall(), is called whenever userspace wishes to perform a system call using the ecall instruction. In this case, the processor raises an ‘Environment call from U-mode’ exception, which is handled as one of the cases in crate::trap::trap_handler.

For clarity, each single syscall is implemented as its own function, named sys_ then the name of the syscall. You can find functions like this in submodules, and you should also implement syscalls this way.

Modules

• fs 🔒
• process 🔒
• sync 🔒
• thread 🔒

Constants

• SYSCALL_CLOSE
  close syscall
• SYSCALL_CONDVAR_CREATE
  condvar_create syscall
• SYSCALL_CONDVAR_SIGNAL
  condvar_signal syscall
• SYSCALL_CONDVAR_WAIT
  condvar_wait syscallca
• SYSCALL_DUP
  dup syscall
• SYSCALL_ENABLE_DEADLOCK_DETECT
  enable deadlock detect syscall
• SYSCALL_EXEC
  exec syscall
• SYSCALL_EXIT
  exit syscall
• SYSCALL_FORK
  fork syscall
• SYSCALL_FSTAT
  fstat syscall
• SYSCALL_GETPID
  getpid syscall
• SYSCALL_GETTID
  gettid syscall
• SYSCALL_GETTIMEOFDAY
  gettimeofday syscall
• SYSCALL_KILL
  kill syscall
• SYSCALL_LINKAT
  linkat syscall
• SYSCALL_MMAP
  mmap syscall
• SYSCALL_MUNMAP
  munmap syscall
• SYSCALL_MUTEX_CREATE
  mutex_create syscall
• SYSCALL_MUTEX_LOCK
  mutex_lock syscall
• SYSCALL_MUTEX_UNLOCK
  mutex_unlock syscall
• SYSCALL_OPENAT
  openat syscall
• SYSCALL_PIPE
  pipe syscall
• SYSCALL_READ
  read syscall
• SYSCALL_SEMAPHORE_CREATE
  semaphore_create syscall
• SYSCALL_SEMAPHORE_DOWN
  semaphore_down syscall
• SYSCALL_SEMAPHORE_UP
  semaphore_up syscall
• SYSCALL_SET_PRIORITY
  set priority syscall
• SYSCALL_SLEEP
  sleep syscall
• SYSCALL_SPAWN
  spawn syscall
• SYSCALL_THREAD_CREATE
  thread_create syscall
• SYSCALL_UNLINKAT
  unlinkat syscall
• SYSCALL_WAITPID
  waitpid syscall
• SYSCALL_WAITTID
  waittid syscall
• SYSCALL_WRITE
  write syscall
• SYSCALL_YIELD
  yield syscall

Functions

• syscall
  handle syscall exception with syscall_id and other arguments