blob: 27e835d4a8728c3465bb1e260a0f0cb206f243a9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
#include <kernel/arch/generic.h>
#include <kernel/panic.h>
#include <kernel/proc.h>
#include <kernel/syscalls.h>
#include <stdint.h>
int sc_exit(const char *msg, size_t len) {
// the message is currently ignored
log_const("last process returned. ");
panic();
}
int sc_debuglog(const char *msg, size_t len) {
struct pagedir *pages = process_current->pages;
void *phys = pagedir_virt2phys(pages, msg, true, false);
// page overrun check
if (((uintptr_t)msg & PAGE_MASK) + len > PAGE_SIZE)
len = PAGE_SIZE - ((uintptr_t)msg & PAGE_MASK);
if (((uintptr_t)msg & PAGE_MASK) + len > PAGE_SIZE)
panic(); // just in case I made an off by 1 error
log_write(phys, len);
return len;
}
int syscall_handler(int num, int a, int b, int c) {
switch (num) {
case SC_EXIT:
sc_exit((void*)a, b);
panic(); // sc_exit should never return
case SC_DEBUGLOG:
return sc_debuglog((void*)a, b);
default:
log_const("unknown syscall ");
panic();
}
}
|
