/*
* Get the arguments to the current system call.
* lwp->lwp_ap normally points to the out regs in the reg structure.
* If the user is going to change the out registers and might want to
* get the args (for /proc tracing), it must copy the args elsewhere
* via save_syscall_args().
*/
uint_t
get_syscall_args(klwp_t *lwp, long *argp, int *nargsp)
{
kthread_t *t = lwptot(lwp);
uint_t code = t->t_sysnum;
long mask;
long *ap;
int nargs;
if (lwptoproc(lwp)->p_model == DATAMODEL_ILP32)
mask = (uint32_t)0xffffffffU;
else
mask = 0xffffffffffffffff;
if (code != 0 && code < NSYSCALL) {
nargs = LWP_GETSYSENT(lwp)[code].sy_narg;
ASSERT(nargs <= MAXSYSARGS);
*nargsp = nargs;
ap = lwp->lwp_ap;
while (nargs-- > 0)
*argp++ = *ap++ & mask;
} else {
*nargsp = 0;
}
return (code);
}
/*
* If this is a process in a branded zone, then we want it to disable the
* brand syscall entry points. This routine must be called when the last
* lwp in a process is exiting in proc_exit().
*/
void
lwp_detach_brand_hdlrs(klwp_t *lwp)
{
kthread_t *t = lwptot(lwp);
ASSERT(PROC_IS_BRANDED(lwptoproc(lwp)));
if (t == curthread)
kpreempt_disable();
/* Remove the original context handlers */
VERIFY(removectx(t, NULL, brand_interpositioning_disable,
brand_interpositioning_enable, NULL, NULL,
brand_interpositioning_disable, NULL) != 0);
if (t == curthread) {
/* Cleanup our MSR and IDT entries. */
brand_interpositioning_disable();
kpreempt_enable();
}
}
/*
* If this is a process in a branded zone, then we want it to use the brand
* syscall entry points instead of the standard Solaris entry points. This
* routine must be called when a new lwp is created within a branded zone
* or when an existing lwp moves into a branded zone via a zone_enter()
* operation.
*/
void
lwp_attach_brand_hdlrs(klwp_t *lwp)
{
kthread_t *t = lwptot(lwp);
ASSERT(PROC_IS_BRANDED(lwptoproc(lwp)));
ASSERT(removectx(t, NULL, brand_interpositioning_disable,
brand_interpositioning_enable, NULL, NULL,
brand_interpositioning_disable, NULL) == 0);
installctx(t, NULL, brand_interpositioning_disable,
brand_interpositioning_enable, NULL, NULL,
brand_interpositioning_disable, NULL);
if (t == curthread) {
kpreempt_disable();
brand_interpositioning_enable();
kpreempt_enable();
}
}
