kern
view src/syscall.c @ 72:3941e82b07f2
- implemented syscalls: exit, waitpid, getppid
- moved sys_whatever functions out of syscall.c into more reasonable files
- putting all the definitions that must be synced with userland to include/kdef.h
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 15 Oct 2011 07:45:56 +0300 |
| parents | 5b29b15c5412 |
| children | 7ff2b4971216 |
line source
1 #include <stdio.h>
2 #include "syscall.h"
3 #include "intr.h"
4 #include "proc.h"
5 #include "sched.h"
6 #include "timer.h"
8 static int (*sys_func[NUM_SYSCALLS])();
10 static void syscall(int inum);
12 static int sys_hello(void);
14 void init_syscall(void)
15 {
16 sys_func[SYS_HELLO] = sys_hello;
17 sys_func[SYS_SLEEP] = sys_sleep; /* timer.c */
18 sys_func[SYS_FORK] = sys_fork; /* proc.c */
19 sys_func[SYS_EXIT] = sys_exit; /* proc.c */
20 sys_func[SYS_WAITPID] = sys_waitpid; /* proc.c */
21 sys_func[SYS_GETPID] = sys_getpid; /* proc.c */
22 sys_func[SYS_GETPPID] = sys_getppid; /* proc.c */
24 interrupt(SYSCALL_INT, syscall);
25 }
27 static void syscall(int inum)
28 {
29 struct intr_frame *frm;
30 int idx;
32 frm = get_intr_frame();
33 idx = frm->regs.eax;
35 if(idx < 0 || idx >= NUM_SYSCALLS) {
36 printf("invalid syscall: %d\n", idx);
37 return;
38 }
40 /* the return value goes into the interrupt frame copy of the user's eax
41 * so that it'll be restored into eax before returning to userland.
42 */
43 frm->regs.eax = sys_func[idx](frm->regs.ebx, frm->regs.ecx, frm->regs.edx, frm->regs.esi, frm->regs.edi);
45 /* we don't necessarily want to return to the same process
46 * might have blocked or exited or whatever, so call schedule
47 * to decide what's going to run next.
48 */
49 schedule();
50 }
52 static int sys_hello(void)
53 {
54 printf("process %d says hello!\n", get_current_pid());
55 return 0;
56 }