void func1(int off)
{
syscall_vga_print_hex(off);
syscall_vga_print_str("ok\n");
for (unsigned i = 0; i < 200000; ++i) {
if (i % 5000 == 0)
syscall_vga_print_str("-");
}
syscall_vga_print_str("exit\n");
syscall_thread_exit();
}
static inline int
syscallenter(struct thread *td, struct syscall_args *sa)
{
struct proc *p;
int error, traced;
PCPU_INC(cnt.v_syscall);
p = td->td_proc;
td->td_pticks = 0;
if (td->td_ucred != p->p_ucred)
cred_update_thread(td);
if (p->p_flag & P_TRACED) {
traced = 1;
PROC_LOCK(p);
td->td_dbgflags &= ~TDB_USERWR;
td->td_dbgflags |= TDB_SCE;
PROC_UNLOCK(p);
} else
traced = 0;
error = (p->p_sysent->sv_fetch_syscall_args)(td, sa);
#ifdef KTRACE
if (KTRPOINT(td, KTR_SYSCALL))
ktrsyscall(sa->code, sa->narg, sa->args);
#endif
CTR6(KTR_SYSC,
"syscall: td=%p pid %d %s (%#lx, %#lx, %#lx)",
td, td->td_proc->p_pid, syscallname(p, sa->code),
sa->args[0], sa->args[1], sa->args[2]);
if (error == 0) {
STOPEVENT(p, S_SCE, sa->narg);
if (p->p_flag & P_TRACED && p->p_stops & S_PT_SCE) {
PROC_LOCK(p);
ptracestop((td), SIGTRAP);
PROC_UNLOCK(p);
}
if (td->td_dbgflags & TDB_USERWR) {
/*
* Reread syscall number and arguments if
* debugger modified registers or memory.
*/
error = (p->p_sysent->sv_fetch_syscall_args)(td, sa);
#ifdef KTRACE
if (KTRPOINT(td, KTR_SYSCALL))
ktrsyscall(sa->code, sa->narg, sa->args);
#endif
if (error != 0)
goto retval;
}
#ifdef CAPABILITY_MODE
/*
* In capability mode, we only allow access to system calls
* flagged with SYF_CAPENABLED.
*/
if (IN_CAPABILITY_MODE(td) &&
!(sa->callp->sy_flags & SYF_CAPENABLED)) {
error = ECAPMODE;
goto retval;
}
#endif
error = syscall_thread_enter(td, sa->callp);
if (error != 0)
goto retval;
#ifdef KDTRACE_HOOKS
/*
* If the systrace module has registered it's probe
* callback and if there is a probe active for the
* syscall 'entry', process the probe.
*/
if (systrace_probe_func != NULL && sa->callp->sy_entry != 0)
(*systrace_probe_func)(sa->callp->sy_entry, sa->code,
sa->callp, sa->args, 0);
#endif
AUDIT_SYSCALL_ENTER(sa->code, td);
error = (sa->callp->sy_call)(td, sa->args);
AUDIT_SYSCALL_EXIT(error, td);
/* Save the latest error return value. */
td->td_errno = error;
#ifdef KDTRACE_HOOKS
/*
* If the systrace module has registered it's probe
* callback and if there is a probe active for the
* syscall 'return', process the probe.
*/
if (systrace_probe_func != NULL && sa->callp->sy_return != 0)
(*systrace_probe_func)(sa->callp->sy_return, sa->code,
sa->callp, NULL, (error) ? -1 : td->td_retval[0]);
#endif
syscall_thread_exit(td, sa->callp);
CTR4(KTR_SYSC, "syscall: p=%p error=%d return %#lx %#lx",
p, error, td->td_retval[0], td->td_retval[1]);
}
retval:
if (traced) {
PROC_LOCK(p);
td->td_dbgflags &= ~TDB_SCE;
PROC_UNLOCK(p);
}
(p->p_sysent->sv_set_syscall_retval)(td, error);
return (error);
}
static void
syscall_handler (struct intr_frame *f)
{
int syscall_num;
VALIDATE_AND_GET_ARG (f->esp, syscall_num, f);
void *cur_sp = f->esp + sizeof (void *);
/* store user program stack pointer to the thread's
user_esp before changing to kernel mode */
struct thread *t = thread_current ();
t->user_esp = f->esp;
switch (syscall_num)
{
case SYS_HALT:
syscall_halt (f, cur_sp);
break;
case SYS_EXIT:
syscall_exit (f, cur_sp);
break;
case SYS_EXEC:
syscall_exec (f, cur_sp);
break;
case SYS_WAIT:
syscall_wait (f, cur_sp);
break;
case SYS_CREATE:
syscall_create (f, cur_sp);
break;
case SYS_REMOVE:
syscall_remove (f, cur_sp);
break;
case SYS_OPEN:
syscall_open (f, cur_sp);
break;
case SYS_FILESIZE:
syscall_filesize (f, cur_sp);
break;
case SYS_READ:
syscall_read (f, cur_sp);
break;
case SYS_WRITE:
syscall_write (f, cur_sp);
break;
case SYS_SEEK:
syscall_seek (f, cur_sp);
break;
case SYS_TELL:
syscall_tell (f, cur_sp);
break;
case SYS_CLOSE:
syscall_close (f, cur_sp);
break;
case SYS_MMAP:
syscall_mmap (f, cur_sp);
break;
case SYS_MUNMAP:
syscall_unmmap (f, cur_sp);
break;
default :
printf ("Invalid system call! #%d\n", syscall_num);
syscall_thread_exit (f, -1);
break;
}
}
