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 🔒
  File and filesystem-related syscalls
• process 🔒
  Process management syscalls

Constants

• SYSCALL_EXEC 🔒
  exec syscall
• SYSCALL_EXIT 🔒
  exit syscall
• SYSCALL_FORK 🔒
  fork syscall
• SYSCALL_GETPID 🔒
  getpid syscall
• SYSCALL_GET_TIME 🔒
  gettime syscall
• SYSCALL_MMAP 🔒
  mmap syscall
• SYSCALL_MUNMAP 🔒
  munmap syscall
• SYSCALL_READ 🔒
  read syscall
• SYSCALL_SBRK 🔒
  sbrk syscall
• SYSCALL_SET_PRIORITY 🔒
  setpriority syscall
• SYSCALL_SPAWN 🔒
  spawn syscall
• SYSCALL_TASK_INFO 🔒
  taskinfo syscall
• SYSCALL_WAITPID 🔒
  waitpid syscall
• SYSCALL_WRITE 🔒
  write syscall
• SYSCALL_YIELD 🔒
  yield syscall

Functions

• syscall
  handle syscall exception with syscall_id and other arguments