/* Let exactly one thread-group leader do a full undump, and
* ensure everyone else does REGSONLY.
* This and the matching logic at dump time together ensure that we
* preserve the thread-group structure that was spawned in user-space.
*
* Returns original pid (>0), or <0 on error
*/
long
cr_thaw_threads(cr_rstrt_proc_req_t *proc_req, int flags, int i_am_leader)
{
struct pt_regs *regs = get_pt_regs(current);
long retval = 0;
if (i_am_leader) {
down(&proc_req->serial_mutex);
retval = vmadump_thaw_proc(proc_req, proc_req->file, regs, flags);
if (retval < 0) {
proc_req->thaw_error = retval;
}
proc_req->done_leader = 1;
wake_up(&proc_req->wait);
up(&proc_req->serial_mutex);
} else if (wait_event_interruptible(proc_req->wait, proc_req->done_leader) < 0) {
retval = -EINTR;
} else if (proc_req->thaw_error) {
retval = proc_req->thaw_error;
} else {
down(&proc_req->serial_mutex);
retval = vmadump_thaw_proc(proc_req, proc_req->file, regs,
flags | VMAD_DUMP_REGSONLY);
if (retval < 0) {
proc_req->thaw_error = retval;
}
up(&proc_req->serial_mutex);
}
return retval;
}
pid_t sys_fork(void)
{
u32 flag = 0;
pt_regs *regs = get_pt_regs();
flag |= PROCESS_TYPE_USER | PROCESS_FLAG_FORK;
return do_fork(NULL, regs, regs->sp, flag);
}
int sys_execve(char __user *filename,
char __user **argv,
char __user **envp)
{
int ret = 0;
pt_regs *regs = get_pt_regs();
ret = do_exec(filename, argv, envp, regs);
if (!ret)
ret = regs->r0;
return ret;
}
/* Let exactly one thread-group leader do a full dump, and
* ensure everyone else does REGSONLY.
* This and the matching logic at undump time together ensure that we
* preserve the thread-group structure that was spawned in user-space.
*
* Returns bytes written (>0), or <0 on error
*/
loff_t
cr_freeze_threads(cr_chkpt_proc_req_t *proc_req, int flags, int i_am_leader)
{
struct pt_regs *regs = get_pt_regs(current);
loff_t retval = 0;
if (i_am_leader) {
down(&proc_req->serial_mutex);
retval = vmadump_freeze_proc(proc_req, proc_req->file, regs, flags | VMAD_DUMP_NOSHANON);
proc_req->done_leader = 1;
wake_up(&proc_req->wait);
up(&proc_req->serial_mutex);
} else if (wait_event_interruptible(proc_req->wait, proc_req->done_leader) < 0) {
retval = -EINTR;
} else {
down(&proc_req->serial_mutex);
retval = vmadump_freeze_proc(proc_req, proc_req->file, regs,
flags | VMAD_DUMP_REGSONLY);
up(&proc_req->serial_mutex);
}
return retval;
}
