void
set_drmarker_hotp_policy_status_table(void *new_table)
{
dr_marker_t *dr_marker = get_drmarker();
ASSERT_OWN_WRITE_LOCK(true, hotp_get_lock());
/* We don't want to write to the dr_marker_t before it is initialized; we
* could get an exception.
*/
if (dr_marker == NULL) /* Part of fix for case 5367. */
return;
/* Ok, dr_marker_t has been initialized. */
/* It is ok to do this memory protection change here even though this can
* be any arbitrary time due to the nature of nudge. This is because
* once initialized, the dr_marker_t isn't touched by any one except the hot
* patch nudge.
*
* TODO: In future other parts of the core may need to change the dr_marker_t.
* It might be a good idea to introduce a lock for the dr_marker_t and
* generic accessor functions.
*/
make_writable((byte*)dr_marker, INTERCEPTION_CODE_SIZE);
dr_marker->dr_hotp_policy_status_table = new_table;
make_unwritable((byte*)dr_marker, INTERCEPTION_CODE_SIZE);
}
/* Returns whether it had to change page protections */
static bool
patch_coarse_branch(cache_pc stub, cache_pc tgt, bool hot_patch,
coarse_info_t *info /*OPTIONAL*/)
{
// COMPLETEDD #498 patch_coarse_branch
bool stubs_readonly = false;
bool stubs_restore = false;
if (DYNAMO_OPTION(persist_protect_stubs)) {
if (info == NULL)
info = get_stub_coarse_info(stub);
ASSERT(info != NULL);
if (info->stubs_readonly) {
stubs_readonly = true;
stubs_restore = true;
/* if we don't preserve mapped-in COW state the protection change
* will fail (case 10570)
*/
make_copy_on_writable((byte *)PAGE_START(entrance_stub_jmp(stub)),
/* stub jmp can't cross page boundary (can't
* cross cache line in fact) */
PAGE_SIZE);
if (DYNAMO_OPTION(persist_protect_stubs_limit) > 0) {
info->stubs_write_count++;
if (info->stubs_write_count >
DYNAMO_OPTION(persist_protect_stubs_limit)) {
SYSLOG_INTERNAL_WARNING_ONCE("pcache stubs over write limit");
STATS_INC(pcache_unprot_over_limit);
stubs_restore = false;
info->stubs_readonly = false;
}
}
}
}
patch_branch(entrance_stub_jmp(stub), tgt, HOT_PATCHABLE);
if (stubs_restore)
make_unwritable((byte *)PAGE_START(entrance_stub_jmp(stub)), PAGE_SIZE);
return stubs_readonly;
}
