void
userret(struct lwp *l)
{
#if defined(__PROG32) && defined(ARM_MMU_EXTENDED)
/*
* If our ASID got released, access via TTBR0 will have been disabled.
* So if it is disabled, activate the lwp again to get a new ASID.
*/
#ifdef __HAVE_PREEMPTION
kpreempt_disable();
#endif
KASSERT(curcpu()->ci_pmap_cur == l->l_proc->p_vmspace->vm_map.pmap);
if (__predict_false(armreg_ttbcr_read() & TTBCR_S_PD0)) {
pmap_activate(l);
}
KASSERT(!(armreg_ttbcr_read() & TTBCR_S_PD0));
#ifdef __HAVE_PREEMPTION
kpreempt_enable();
#endif
#endif
/* Invoke MI userret code */
mi_userret(l);
#if defined(__PROG32) && defined(DIAGNOSTIC)
KASSERT(VALID_R15_PSR(lwp_trapframe(l)->tf_pc,
lwp_trapframe(l)->tf_spsr));
#endif
}
/*
* trap and syscall both need the following work done before returning
* to user mode.
*/
static inline void
userret(struct lwp *l, struct frame *fp, u_quad_t oticks, u_int faultaddr,
int fromtrap)
{
struct proc *p = l->l_proc;
#ifdef M68040
int sig;
int beenhere = 0;
again:
#endif
/* Invoke MI userret code */
mi_userret(l);
/*
* If profiling, charge system time to the trapped pc.
*/
if (p->p_stflag & PST_PROFIL) {
extern int psratio;
addupc_task(l, fp->f_pc,
(int)(p->p_sticks - oticks) * psratio);
}
#ifdef M68040
/*
* Deal with user mode writebacks (from trap, or from sigreturn).
* If any writeback fails, go back and attempt signal delivery.
* unless we have already been here and attempted the writeback
* (e.g. bad address with user ignoring SIGSEGV). In that case
* we just return to the user without successfully completing
* the writebacks. Maybe we should just drop the sucker?
*/
if (
#if defined(M68030) || defined(M68060)
cputype == CPU_68040 &&
#endif
fp->f_format == FMT7) {
if (beenhere) {
#ifdef DEBUG
if (mmudebug & MDB_WBFAILED)
printf(fromtrap ?
"pid %d(%s): writeback aborted, pc=%x, fa=%x\n" :
"pid %d(%s): writeback aborted in sigreturn, pc=%x\n",
p->p_pid, p->p_comm, fp->f_pc, faultaddr);
#endif
} else if ((sig = writeback(fp, fromtrap))) {
ksiginfo_t ksi;
beenhere = 1;
oticks = p->p_sticks;
(void)memset(&ksi, 0, sizeof(ksi));
ksi.ksi_signo = sig;
ksi.ksi_addr = (void *)faultaddr;
ksi.ksi_code = BUS_OBJERR;
trapsignal(l, &ksi);
goto again;
}
}
#endif
}
/*
* trap and syscall both need the following work done before
* returning to user mode.
*/
static void
userret(struct lwp *l, struct trapframe *tf, u_quad_t oticks)
{
struct proc *p = l->l_proc;
/* Invoke MI userret code */
mi_userret(l);
/*
* If profiling, charge system time to the trapped pc.
*/
if (p->p_stflag & PST_PROFIL) {
extern int psratio;
addupc_task(l, tf->tf_pc,
(int)(p->p_sticks - oticks) * psratio);
}
}
