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_CLOSE 🔒

close syscall

SYSCALL_EXEC 🔒

exec syscall

SYSCALL_EXIT 🔒

exit syscall

SYSCALL_FORK 🔒

fork syscall

SYSCALL_FSTAT 🔒

fstat syscall

SYSCALL_GETPID 🔒

getpid syscall

SYSCALL_GET_TIME 🔒

gettime syscall

SYSCALL_LINKAT 🔒

linkat syscall

SYSCALL_MMAP 🔒

mmap syscall

SYSCALL_MUNMAP 🔒

munmap syscall

SYSCALL_OPEN 🔒

open syscall

SYSCALL_READ 🔒

read syscall

SYSCALL_SBRK 🔒

sbrk syscall

SYSCALL_SET_PRIORITY 🔒

setpriority syscall

SYSCALL_SPAWN 🔒

spawn syscall

SYSCALL_TASK_INFO 🔒

taskinfo syscall

SYSCALL_UNLINKAT 🔒

unlinkat syscall

SYSCALL_WAITPID 🔒

waitpid syscall

SYSCALL_WRITE 🔒

write syscall

SYSCALL_YIELD 🔒

yield syscall

Functions

syscall

handle syscall exception with syscall_id and other arguments