int
sys_sigreturn(struct thread *td, struct sigreturn_args *uap)
{
uint64_t sstatus;
ucontext_t uc;
int error;
if (uap == NULL)
return (EFAULT);
if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
return (EFAULT);
/*
* Make sure the processor mode has not been tampered with and
* interrupts have not been disabled.
*/
sstatus = uc.uc_mcontext.mc_gpregs.gp_sstatus;
if ((sstatus & SSTATUS_PS) != 0 ||
(sstatus & SSTATUS_PIE) == 0)
return (EINVAL);
error = set_mcontext(td, &uc.uc_mcontext);
if (error != 0)
return (error);
set_fpcontext(td, &uc.uc_mcontext);
/* Restore signal mask. */
kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
return (EJUSTRETURN);
}
int
sys_sigreturn(struct thread *td, struct sigreturn_args *uap)
{
ucontext_t uc;
uint32_t spsr;
if (uap == NULL)
return (EFAULT);
if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
return (EFAULT);
spsr = uc.uc_mcontext.mc_gpregs.gp_spsr;
if ((spsr & PSR_M_MASK) != PSR_M_EL0t ||
(spsr & (PSR_F | PSR_I | PSR_A | PSR_D)) != 0)
return (EINVAL);
set_mcontext(td, &uc.uc_mcontext);
set_fpcontext(td, &uc.uc_mcontext);
/* Restore signal mask. */
kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
return (EJUSTRETURN);
}