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#include <kernel/arch/generic.h>
#include <kernel/panic.h>
#include <kernel/proc.h>
#include <kernel/syscalls.h>
#include <stdint.h>
_Noreturn void _syscall_exit(const char *msg, size_t len) {
process_current->state = PS_DEAD;
process_current = process_find(PS_RUNNING);
if (process_current)
process_switch(process_current);
log_const("last process returned. ");
panic();
}
int _syscall_fork() {
struct process *orig = process_current;
process_current = process_clone(orig);
process_switch(process_current);
}
int _syscall_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 _SYSCALL_EXIT:
_syscall_exit((void*)a, b);
case _SYSCALL_FORK:
return _syscall_fork();
case _SYSCALL_DEBUGLOG:
return _syscall_debuglog((void*)a, b);
default:
log_const("unknown syscall ");
panic();
}
}
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