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|
/* The kernel call implemented in this file:
* m_type: SYS_UPDATE
*
* The parameters for this kernel call are:
* m2_i1: SYS_UPD_SRC_ENDPT (source process endpoint)
* m2_i2: SYS_UPD_DST_ENDPT (destination process endpoint)
* m2_i3: SYS_UPD_FLAGS (update flags)
*/
#include "kernel/system.h"
#include <string.h>
#include <assert.h>
#if USE_UPDATE
#define DEBUG 0
#define proc_is_updatable(p) \
(RTS_ISSET(p, RTS_NO_PRIV) || RTS_ISSET(p, RTS_SIG_PENDING) \
|| (RTS_ISSET(p, RTS_RECEIVING) && !RTS_ISSET(p, RTS_SENDING)))
static int inherit_priv_irq(struct proc *src_rp, struct proc *dst_rp);
static int inherit_priv_io(struct proc *src_rp, struct proc *dst_rp);
static int inherit_priv_mem(struct proc *src_rp, struct proc *dst_rp);
static void abort_proc_ipc_send(struct proc *rp);
static void adjust_proc_slot(struct proc *rp, struct proc *from_rp);
static void adjust_priv_slot(struct priv *privp, struct priv
*from_privp);
static void adjust_asyn_table(struct priv *src_privp, struct priv *dst_privp);
static void swap_proc_slot_pointer(struct proc **rpp, struct proc
*src_rp, struct proc *dst_rp);
static void swap_memreq(struct proc *src_rp, struct proc *dst_rp);
/*===========================================================================*
* do_update *
*===========================================================================*/
int do_update(struct proc * caller, message * m_ptr)
{
/* Handle sys_update(). Update a process into another by swapping their process
* slots.
*/
endpoint_t src_e, dst_e;
int src_p, dst_p, flags;
struct proc *src_rp, *dst_rp;
struct priv *src_privp, *dst_privp;
struct proc orig_src_proc;
struct proc orig_dst_proc;
struct priv orig_src_priv;
struct priv orig_dst_priv;
int i, r;
/* Lookup slots for source and destination process. */
flags = m_ptr->SYS_UPD_FLAGS;
src_e = m_ptr->SYS_UPD_SRC_ENDPT;
if(!isokendpt(src_e, &src_p)) {
return EINVAL;
}
src_rp = proc_addr(src_p);
src_privp = priv(src_rp);
if(!(src_privp->s_flags & SYS_PROC)) {
return EPERM;
}
dst_e = m_ptr->SYS_UPD_DST_ENDPT;
if(!isokendpt(dst_e, &dst_p)) {
return EINVAL;
}
dst_rp = proc_addr(dst_p);
dst_privp = priv(dst_rp);
if(!(dst_privp->s_flags & SYS_PROC)) {
return EPERM;
}
assert(!proc_is_runnable(src_rp) && !proc_is_runnable(dst_rp));
/* Check if processes are updatable. */
if(!proc_is_updatable(src_rp) || !proc_is_updatable(dst_rp)) {
return EBUSY;
}
#if DEBUG
printf("do_update: updating %d (%s, %d, %d) into %d (%s, %d, %d)\n",
src_rp->p_endpoint, src_rp->p_name, src_rp->p_nr, priv(src_rp)->s_proc_nr,
dst_rp->p_endpoint, dst_rp->p_name, dst_rp->p_nr, priv(dst_rp)->s_proc_nr);
proc_stacktrace(src_rp);
proc_stacktrace(dst_rp);
printf("do_update: curr ptproc %d\n", get_cpulocal_var(ptproc)->p_endpoint);
printf("do_update: endpoint %d rts flags %x asyn tab %08x asyn endpoint %d grant tab %08x grant endpoint %d\n", src_rp->p_endpoint, src_rp->p_rts_flags, priv(src_rp)->s_asyntab, priv(src_rp)->s_asynendpoint, priv(src_rp)->s_grant_table, priv(src_rp)->s_grant_endpoint);
printf("do_update: endpoint %d rts flags %x asyn tab %08x asyn endpoint %d grant tab %08x grant endpoint %d\n", dst_rp->p_endpoint, dst_rp->p_rts_flags, priv(dst_rp)->s_asyntab, priv(dst_rp)->s_asynendpoint, priv(dst_rp)->s_grant_table, priv(dst_rp)->s_grant_endpoint);
#endif
/* Let destination inherit allowed IRQ, I/O ranges, and memory ranges. */
r = inherit_priv_irq(src_rp, dst_rp);
if(r != OK) {
return r;
}
r = inherit_priv_io(src_rp, dst_rp);
if(r != OK) {
return r;
}
r = inherit_priv_mem(src_rp, dst_rp);
if(r != OK) {
return r;
}
/* Let destination inherit the target mask from source. */
for (i=0; i < NR_SYS_PROCS; i++) {
if (get_sys_bit(priv(src_rp)->s_ipc_to, i)) {
set_sendto_bit(dst_rp, i);
}
}
/* Save existing data. */
orig_src_proc = *src_rp;
orig_src_priv = *(priv(src_rp));
orig_dst_proc = *dst_rp;
orig_dst_priv = *(priv(dst_rp));
/* Adjust asyn tables. */
adjust_asyn_table(priv(src_rp), priv(dst_rp));
adjust_asyn_table(priv(dst_rp), priv(src_rp));
/* Abort any pending send() on rollback. */
if(flags & SYS_UPD_ROLLBACK) {
abort_proc_ipc_send(src_rp);
}
/* Swap slots. */
*src_rp = orig_dst_proc;
*src_privp = orig_dst_priv;
*dst_rp = orig_src_proc;
*dst_privp = orig_src_priv;
/* Adjust process slots. */
adjust_proc_slot(src_rp, &orig_src_proc);
adjust_proc_slot(dst_rp, &orig_dst_proc);
/* Adjust privilege slots. */
adjust_priv_slot(priv(src_rp), &orig_src_priv);
adjust_priv_slot(priv(dst_rp), &orig_dst_priv);
/* Swap global process slot addresses. */
swap_proc_slot_pointer(get_cpulocal_var_ptr(ptproc), src_rp, dst_rp);
/* Swap VM request entries. */
swap_memreq(src_rp, dst_rp);
#if DEBUG
printf("do_update: updated %d (%s, %d, %d) into %d (%s, %d, %d)\n",
src_rp->p_endpoint, src_rp->p_name, src_rp->p_nr, priv(src_rp)->s_proc_nr,
dst_rp->p_endpoint, dst_rp->p_name, dst_rp->p_nr, priv(dst_rp)->s_proc_nr);
proc_stacktrace(src_rp);
proc_stacktrace(dst_rp);
printf("do_update: curr ptproc %d\n", get_cpulocal_var(ptproc)->p_endpoint);
printf("do_update: endpoint %d rts flags %x asyn tab %08x asyn endpoint %d grant tab %08x grant endpoint %d\n", src_rp->p_endpoint, src_rp->p_rts_flags, priv(src_rp)->s_asyntab, priv(src_rp)->s_asynendpoint, priv(src_rp)->s_grant_table, priv(src_rp)->s_grant_endpoint);
printf("do_update: endpoint %d rts flags %x asyn tab %08x asyn endpoint %d grant tab %08x grant endpoint %d\n", dst_rp->p_endpoint, dst_rp->p_rts_flags, priv(dst_rp)->s_asyntab, priv(dst_rp)->s_asynendpoint, priv(dst_rp)->s_grant_table, priv(dst_rp)->s_grant_endpoint);
#endif
#ifdef CONFIG_SMP
bits_fill(src_rp->p_stale_tlb, CONFIG_MAX_CPUS);
bits_fill(dst_rp->p_stale_tlb, CONFIG_MAX_CPUS);
#endif
return OK;
}
/*===========================================================================*
* inherit_priv_irq *
*===========================================================================*/
int inherit_priv_irq(struct proc *src_rp, struct proc *dst_rp)
{
int i, r;
for (i= 0; i<priv(src_rp)->s_nr_irq; i++) {
r = priv_add_irq(dst_rp, priv(src_rp)->s_irq_tab[i]);
if(r != OK) {
return r;
}
}
return OK;
}
/*===========================================================================*
* inherit_priv_io *
*===========================================================================*/
int inherit_priv_io(struct proc *src_rp, struct proc *dst_rp)
{
int i, r;
for (i= 0; i<priv(src_rp)->s_nr_io_range; i++) {
r = priv_add_io(dst_rp, &(priv(src_rp)->s_io_tab[i]));
if(r != OK) {
return r;
}
}
return OK;
}
/*===========================================================================*
* inherit_priv_mem *
*===========================================================================*/
int inherit_priv_mem(struct proc *src_rp, struct proc *dst_rp)
{
int i, r;
for (i= 0; i<priv(src_rp)->s_nr_mem_range; i++) {
r = priv_add_mem(dst_rp, &(priv(src_rp)->s_mem_tab[i]));
if(r != OK) {
return r;
}
}
return OK;
}
/*===========================================================================*
* abort_proc_ipc_send *
*===========================================================================*/
void abort_proc_ipc_send(struct proc *rp)
{
if(RTS_ISSET(rp, RTS_SENDING)) {
struct proc **xpp;
RTS_UNSET(rp, RTS_SENDING);
rp->p_misc_flags &= ~MF_SENDING_FROM_KERNEL;
xpp = &(proc_addr(_ENDPOINT_P(rp->p_sendto_e))->p_caller_q);
while (*xpp) {
if(*xpp == rp) {
*xpp = rp->p_q_link;
rp->p_q_link = NULL;
break;
}
xpp = &(*xpp)->p_q_link;
}
}
}
/*===========================================================================*
* adjust_proc_slot *
*===========================================================================*/
static void adjust_proc_slot(struct proc *rp, struct proc *from_rp)
{
/* Preserve endpoints, slot numbers, priv structure, and IPC. */
rp->p_endpoint = from_rp->p_endpoint;
rp->p_nr = from_rp->p_nr;
rp->p_priv = from_rp->p_priv;
priv(rp)->s_proc_nr = from_rp->p_nr;
rp->p_caller_q = from_rp->p_caller_q;
/* preserve scheduling */
rp->p_scheduler = from_rp->p_scheduler;
#ifdef CONFIG_SMP
rp->p_cpu = from_rp->p_cpu;
memcpy(rp->p_cpu_mask, from_rp->p_cpu_mask,
sizeof(bitchunk_t) * BITMAP_CHUNKS(CONFIG_MAX_CPUS));
#endif
}
/*===========================================================================*
* adjust_asyn_table *
*===========================================================================*/
static void adjust_asyn_table(struct priv *src_privp, struct priv *dst_privp)
{
/* Transfer the asyn table if source's table belongs to the destination. */
endpoint_t src_e = proc_addr(src_privp->s_proc_nr)->p_endpoint;
endpoint_t dst_e = proc_addr(dst_privp->s_proc_nr)->p_endpoint;
if(src_privp->s_asynsize > 0 && dst_privp->s_asynsize > 0 && src_privp->s_asynendpoint == dst_e) {
if(data_copy(src_e, src_privp->s_asyntab, dst_e, dst_privp->s_asyntab,
src_privp->s_asynsize*sizeof(asynmsg_t)) != OK) {
printf("Warning: unable to transfer asyn table from ep %d to ep %d\n",
src_e, dst_e);
}
else {
dst_privp->s_asynsize = src_privp->s_asynsize;
}
}
}
/*===========================================================================*
* adjust_priv_slot *
*===========================================================================*/
static void adjust_priv_slot(struct priv *privp, struct priv *from_privp)
{
/* Preserve privilege ids and non-privilege stuff in the priv structure. */
privp->s_id = from_privp->s_id;
privp->s_asyn_pending = from_privp->s_asyn_pending;
privp->s_notify_pending = from_privp->s_notify_pending;
privp->s_int_pending = from_privp->s_int_pending;
privp->s_sig_pending = from_privp->s_sig_pending;
privp->s_alarm_timer = from_privp->s_alarm_timer;
privp->s_diag_sig = from_privp->s_diag_sig;
}
/*===========================================================================*
* swap_proc_slot_pointer *
*===========================================================================*/
static void swap_proc_slot_pointer(struct proc **rpp, struct proc *src_rp,
struct proc *dst_rp)
{
if(*rpp == src_rp) {
*rpp = dst_rp;
}
else if(*rpp == dst_rp) {
*rpp = src_rp;
}
}
/*===========================================================================*
* swap_memreq *
*===========================================================================*/
static void swap_memreq(struct proc *src_rp, struct proc *dst_rp)
{
/* If either the source or the destination process is part of the VM request
* chain, but not both, then swap the process pointers in the chain.
*/
struct proc **rpp;
if (RTS_ISSET(src_rp, RTS_VMREQUEST) == RTS_ISSET(dst_rp, RTS_VMREQUEST))
return; /* nothing to do */
for (rpp = &vmrequest; *rpp != NULL;
rpp = &(*rpp)->p_vmrequest.nextrequestor) {
if (*rpp == src_rp) {
dst_rp->p_vmrequest.nextrequestor =
src_rp->p_vmrequest.nextrequestor;
*rpp = dst_rp;
break;
} else if (*rpp == dst_rp) {
src_rp->p_vmrequest.nextrequestor =
dst_rp->p_vmrequest.nextrequestor;
*rpp = src_rp;
break;
}
}
}
#endif /* USE_UPDATE */
|
