static
void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs,
long id);
+static
+void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs,
+ long ret);
/*
* Forward declarations for old kernels.
};
static void syscall_entry_event_unknown(struct lttng_event *event,
- struct pt_regs *regs, unsigned int id)
+ struct pt_regs *regs, long id)
{
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
}
static void syscall_entry_event_notifier_unknown(
- struct lttng_event_notifier_group *notifier_group,
- struct pt_regs *regs, unsigned int id)
+ struct hlist_head *unknown_dispatch_list_head,
+ struct pt_regs *regs, long id)
{
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- struct lttng_event *event;
+ struct lttng_event_notifier *notifier;
lttng_syscall_get_arguments(current, regs, args);
- if (unlikely(in_compat_syscall()))
- __event_probe__compat_syscall_notifier_entry_unknown(event, id, args);
- else
- __event_probe__syscall_notifier_entry_unknown(event, id, args);
+ lttng_hlist_for_each_entry_rcu(notifier, unknown_dispatch_list_head, u.syscall.node) {
+ if (unlikely(in_compat_syscall()))
+ __event_notifier_probe__compat_syscall_entry_unknown(notifier, id, args);
+ else
+ __event_notifier_probe__syscall_entry_unknown(notifier, id, args);
+ }
+}
+
+static void syscall_exit_event_notifier_unknown(
+ struct hlist_head *unknown_dispatch_list_head,
+ struct pt_regs *regs, long id, long ret)
+{
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+ struct lttng_event_notifier *notifier;
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, unknown_dispatch_list_head, u.syscall.node) {
+ if (unlikely(in_compat_syscall()))
+ __event_notifier_probe__compat_syscall_exit_unknown(notifier, id, ret, args);
+ else
+ __event_notifier_probe__syscall_exit_unknown(notifier, id, ret, args);
+ }
}
static __always_inline
}
}
+static __always_inline
+void syscall_entry_event_notifier_call_func(struct hlist_head *dispatch_list,
+ void *func, unsigned int nrargs, struct pt_regs *regs)
+{
+ struct lttng_event_notifier *notifier;
+
+ switch (nrargs) {
+ case 0:
+ {
+ void (*fptr)(void *__data) = func;
+
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier);
+ break;
+ }
+ case 1:
+ {
+ void (*fptr)(void *__data, unsigned long arg0) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0]);
+ break;
+ }
+ case 2:
+ {
+ void (*fptr)(void *__data,
+ unsigned long arg0,
+ unsigned long arg1) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0], args[1]);
+ break;
+ }
+ case 3:
+ {
+ void (*fptr)(void *__data,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0], args[1], args[2]);
+ break;
+ }
+ case 4:
+ {
+ void (*fptr)(void *__data,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0], args[1], args[2], args[3]);
+ break;
+ }
+ case 5:
+ {
+ void (*fptr)(void *__data,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3,
+ unsigned long arg4) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0], args[1], args[2], args[3], args[4]);
+ break;
+ }
+ case 6:
+ {
+ void (*fptr)(void *__data,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3,
+ unsigned long arg4,
+ unsigned long arg5) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0], args[1], args[2], args[3], args[4], args[5]);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id)
{
struct lttng_channel *chan = __data;
return;
}
entry = &table[id];
- WARN_ON_ONCE(!entry);
+ WARN_ON_ONCE(!entry->event_func);
syscall_entry_call_func(entry->event_func, entry->nrargs, event, regs);
}
-void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, long id)
+void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs,
+ long id)
{
- struct lttng_event_notifier_group *event_notifier_group = __data;
- const struct trace_syscall_entry *entry;
- struct list_head *dispatch_list;
- struct lttng_event_notifier *iter;
+ struct lttng_event_notifier_group *group = __data;
+ const struct trace_syscall_entry *table, *entry;
+ struct hlist_head *dispatch_list, *unknown_dispatch_list;
size_t table_len;
if (unlikely(in_compat_syscall())) {
- table_len = ARRAY_SIZE(compat_sc_table);
- if (unlikely(id < 0 || id >= table_len)) {
+ struct lttng_syscall_filter *filter = group->sc_filter;
+
+ if (id < 0 || id >= NR_compat_syscalls
+ || (!READ_ONCE(group->syscall_all_entry) &&
+ !test_bit(id, filter->sc_compat_entry))) {
+ /* System call filtered out. */
return;
}
- entry = &compat_sc_table[id];
- dispatch_list = &event_notifier_group->event_notifier_compat_syscall_dispatch[id];
+ table = compat_sc_table;
+ table_len = ARRAY_SIZE(compat_sc_table);
+ unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch;
} else {
- table_len = ARRAY_SIZE(sc_table);
- if (unlikely(id < 0 || id >= table_len)) {
+ struct lttng_syscall_filter *filter = group->sc_filter;
+
+ if (id < 0 || id >= NR_syscalls
+ || (!READ_ONCE(group->syscall_all_entry) &&
+ !test_bit(id, filter->sc_entry))) {
+ /* System call filtered out. */
return;
}
- entry = &sc_table[id];
- dispatch_list = &event_notifier_group->event_notifier_syscall_dispatch[id];
+ table = sc_table;
+ table_len = ARRAY_SIZE(sc_table);
+ unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch;
}
-
+ /* Check if the syscall id is out of bound. */
if (unlikely(id < 0 || id >= table_len)) {
- syscall_entry_event_notifier_unknown(event_notifier_group, regs, id);
+ syscall_entry_event_notifier_unknown(unknown_dispatch_list,
+ regs, id);
return;
}
- /* TODO handle unknown syscall */
+ entry = &table[id];
+ if (!entry->event_notifier_func) {
+ syscall_entry_event_notifier_unknown(unknown_dispatch_list,
+ regs, id);
+ return;
+ }
- list_for_each_entry_rcu(iter, dispatch_list, u.syscall.node) {
- BUG_ON(iter->u.syscall.syscall_id != id);
- syscall_entry_call_func(entry->event_notifier_func,
- entry->nrargs, iter, regs);
+ if (unlikely(in_compat_syscall())) {
+ dispatch_list = &group->event_notifier_compat_syscall_dispatch[id];
+ } else {
+ dispatch_list = &group->event_notifier_syscall_dispatch[id];
}
+ if (unlikely(hlist_empty(dispatch_list)))
+ return;
+
+ syscall_entry_event_notifier_call_func(dispatch_list,
+ entry->event_notifier_func, entry->nrargs, regs);
}
static void syscall_exit_event_unknown(struct lttng_event *event,
- struct pt_regs *regs, int id, long ret)
+ struct pt_regs *regs, long id, long ret)
{
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
return;
}
entry = &table[id];
- WARN_ON_ONCE(!entry);
+ WARN_ON_ONCE(!entry->event_func);
switch (entry->nrargs) {
case 0:
}
}
+static __always_inline
+void syscall_exit_event_notifier_call_func(struct hlist_head *dispatch_list,
+ void *func, unsigned int nrargs, struct pt_regs *regs, long ret)
+{
+ struct lttng_event_notifier *notifier;
+
+ switch (nrargs) {
+ case 0:
+ {
+ void (*fptr)(void *__data, long ret) = func;
+
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret);
+ break;
+ }
+ case 1:
+ {
+ void (*fptr)(void *__data, long ret, unsigned long arg0) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0]);
+ break;
+ }
+ case 2:
+ {
+ void (*fptr)(void *__data,
+ long ret,
+ unsigned long arg0,
+ unsigned long arg1) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0], args[1]);
+ break;
+ }
+ case 3:
+ {
+ void (*fptr)(void *__data,
+ long ret,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0], args[1], args[2]);
+ break;
+ }
+ case 4:
+ {
+ void (*fptr)(void *__data,
+ long ret,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0], args[1], args[2], args[3]);
+ break;
+ }
+ case 5:
+ {
+ void (*fptr)(void *__data,
+ long ret,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3,
+ unsigned long arg4) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0], args[1], args[2], args[3], args[4]);
+ break;
+ }
+ case 6:
+ {
+ void (*fptr)(void *__data,
+ long ret,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3,
+ unsigned long arg4,
+ unsigned long arg5) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0], args[1], args[2], args[3], args[4], args[5]);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+static
+void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs,
+ long ret)
+{
+ struct lttng_event_notifier_group *group = __data;
+ const struct trace_syscall_entry *table, *entry;
+ struct hlist_head *dispatch_list, *unknown_dispatch_list;
+ size_t table_len;
+ long id;
+
+ id = syscall_get_nr(current, regs);
+
+ if (unlikely(in_compat_syscall())) {
+ struct lttng_syscall_filter *filter = group->sc_filter;
+
+ if (id < 0 || id >= NR_compat_syscalls
+ || (!READ_ONCE(group->syscall_all_exit) &&
+ !test_bit(id, filter->sc_compat_exit))) {
+ /* System call filtered out. */
+ return;
+ }
+ table = compat_sc_exit_table;
+ table_len = ARRAY_SIZE(compat_sc_exit_table);
+ unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch;
+ } else {
+ struct lttng_syscall_filter *filter = group->sc_filter;
+
+ if (id < 0 || id >= NR_syscalls
+ || (!READ_ONCE(group->syscall_all_exit) &&
+ !test_bit(id, filter->sc_exit))) {
+ /* System call filtered out. */
+ return;
+ }
+ table = sc_exit_table;
+ table_len = ARRAY_SIZE(sc_exit_table);
+ unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch;
+ }
+ /* Check if the syscall id is out of bound. */
+ if (unlikely(id < 0 || id >= table_len)) {
+ syscall_exit_event_notifier_unknown(unknown_dispatch_list,
+ regs, id, ret);
+ return;
+ }
+
+ entry = &table[id];
+ if (!entry->event_notifier_func) {
+ syscall_entry_event_notifier_unknown(unknown_dispatch_list,
+ regs, id);
+ return;
+ }
+
+ if (unlikely(in_compat_syscall())) {
+ dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id];
+ } else {
+ dispatch_list = &group->event_notifier_exit_syscall_dispatch[id];
+ }
+ if (unlikely(hlist_empty(dispatch_list)))
+ return;
+
+ syscall_exit_event_notifier_call_func(dispatch_list,
+ entry->event_notifier_func, entry->nrargs, regs, ret);
+}
/*
* noinline to diminish caller stack size.
* Should be called with sessions lock held.
/*
* Should be called with sessions lock held.
*/
-int lttng_syscalls_register_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter)
+int lttng_syscalls_register_event_notifier(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ void *filter)
{
struct lttng_event_notifier_group *group = event_notifier_enabler->group;
unsigned int i;
wrapper_vmalloc_sync_mappings();
if (!group->event_notifier_syscall_dispatch) {
- group->event_notifier_syscall_dispatch = kzalloc(sizeof(struct list_head)
- * ARRAY_SIZE(sc_table), GFP_KERNEL);
+ group->event_notifier_syscall_dispatch =
+ kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table),
+ GFP_KERNEL);
if (!group->event_notifier_syscall_dispatch)
return -ENOMEM;
/* Initialize all list_head */
for (i = 0; i < ARRAY_SIZE(sc_table); i++)
- INIT_LIST_HEAD(&group->event_notifier_syscall_dispatch[i]);
+ INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]);
+
+ /* Init the unknown syscall notifier list. */
+ INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch);
+ }
+
+ if (!group->event_notifier_exit_syscall_dispatch) {
+ group->event_notifier_exit_syscall_dispatch =
+ kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table),
+ GFP_KERNEL);
+ if (!group->event_notifier_exit_syscall_dispatch)
+ return -ENOMEM;
+
+ /* Initialize all list_head */
+ for (i = 0; i < ARRAY_SIZE(sc_table); i++)
+ INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]);
+
+ /* Init the unknown exit syscall notifier list. */
+ INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch);
}
#ifdef CONFIG_COMPAT
if (!group->event_notifier_compat_syscall_dispatch) {
- group->event_notifier_compat_syscall_dispatch = kzalloc(sizeof(struct list_head)
- * ARRAY_SIZE(compat_sc_table), GFP_KERNEL);
+ group->event_notifier_compat_syscall_dispatch =
+ kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_table),
+ GFP_KERNEL);
if (!group->event_notifier_syscall_dispatch)
return -ENOMEM;
/* Initialize all list_head */
for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++)
- INIT_LIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]);
+ INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]);
+
+ /* Init the unknown syscall notifier list. */
+ INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch);
+ }
+
+ if (!group->event_notifier_exit_compat_syscall_dispatch) {
+ group->event_notifier_exit_compat_syscall_dispatch =
+ kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_exit_table),
+ GFP_KERNEL);
+ if (!group->event_notifier_exit_syscall_dispatch)
+ return -ENOMEM;
+
+ /* Initialize all list_head */
+ for (i = 0; i < ARRAY_SIZE(compat_sc_exit_table); i++)
+ INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]);
+
+ /* Init the unknown exit syscall notifier list. */
+ INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch);
}
#endif
+ if (!group->sc_filter) {
+ group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter),
+ GFP_KERNEL);
+ if (!group->sc_filter)
+ return -ENOMEM;
+ }
+
if (!group->sys_enter_registered) {
ret = lttng_wrapper_tracepoint_probe_register("sys_enter",
(void *) syscall_entry_event_notifier_probe, group);
group->sys_enter_registered = 1;
}
+ if (!group->sys_exit_registered) {
+ ret = lttng_wrapper_tracepoint_probe_register("sys_exit",
+ (void *) syscall_exit_event_notifier_probe, group);
+ if (ret) {
+ WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
+ (void *) syscall_entry_event_notifier_probe, group));
+ return ret;
+ }
+ group->sys_exit_registered = 1;
+ }
+
+ return ret;
+}
+
+static
+int create_unknown_event_notifier(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ enum sc_type type)
+{
+ struct lttng_event_notifier *notifier;
+ const struct lttng_event_desc *desc;
+ struct lttng_event_notifier_group *group = event_notifier_enabler->group;
+ struct lttng_kernel_event_notifier event_notifier_param;
+ uint64_t user_token = event_notifier_enabler->base.user_token;
+ uint64_t error_counter_index = event_notifier_enabler->error_counter_index;
+ struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
+ event_notifier_enabler);
+ struct hlist_head *unknown_dispatch_list;
+ int ret = 0;
+ bool found = false;
+ enum lttng_kernel_syscall_abi abi;
+ enum lttng_kernel_syscall_entryexit entryexit;
+ struct hlist_head *head;
+
+ switch (type) {
+ case SC_TYPE_ENTRY:
+ desc = &__event_desc___syscall_entry_unknown;
+ unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch;
+ entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_EXIT:
+ desc = &__event_desc___syscall_exit_unknown;
+ unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch;
+ entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_COMPAT_ENTRY:
+ desc = &__event_desc___compat_syscall_entry_unknown;
+ unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch;
+ entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ case SC_TYPE_COMPAT_EXIT:
+ desc = &__event_desc___compat_syscall_exit_unknown;
+ unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch;
+ entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ default:
+ BUG_ON(1);
+ }
+
+ /*
+ * Check if already created.
+ */
+ head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table,
+ LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name);
+ lttng_hlist_for_each_entry(notifier, head, hlist) {
+ if (notifier->desc == desc &&
+ notifier->user_token == base_enabler->user_token)
+ found = true;
+ }
+ if (found)
+ goto end;
+
+ memset(&event_notifier_param, 0, sizeof(event_notifier_param));
+ strncat(event_notifier_param.event.name, desc->name,
+ LTTNG_KERNEL_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1);
+
+ event_notifier_param.event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+
+ event_notifier_param.event.instrumentation = LTTNG_KERNEL_SYSCALL;
+ event_notifier_param.event.u.syscall.abi = abi;
+ event_notifier_param.event.u.syscall.entryexit = entryexit;
+
+ notifier = _lttng_event_notifier_create(desc, user_token,
+ error_counter_index, group, &event_notifier_param, NULL,
+ event_notifier_param.event.instrumentation);
+ if (IS_ERR(notifier)) {
+ printk(KERN_INFO "Unable to create unknown notifier %s\n",
+ desc->name);
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ hlist_add_head_rcu(¬ifier->u.syscall.node, unknown_dispatch_list);
+
+end:
return ret;
}
-static int create_matching_event_notifiers(struct lttng_event_notifier_enabler *event_notifier_enabler,
+static int create_matching_event_notifiers(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
void *filter, const struct trace_syscall_entry *table,
- size_t table_len, bool is_compat)
+ size_t table_len, enum sc_type type)
{
struct lttng_event_notifier_group *group = event_notifier_enabler->group;
const struct lttng_event_desc *desc;
uint64_t user_token = event_notifier_enabler->base.user_token;
+ uint64_t error_counter_index = event_notifier_enabler->error_counter_index;
unsigned int i;
int ret = 0;
continue;
memset(&event_notifier_param, 0, sizeof(event_notifier_param));
+ switch (type) {
+ case SC_TYPE_ENTRY:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_EXIT:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_COMPAT_ENTRY:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ case SC_TYPE_COMPAT_EXIT:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ }
strncat(event_notifier_param.event.name, desc->name,
LTTNG_KERNEL_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1);
event_notifier_param.event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
event_notifier_param.event.instrumentation = LTTNG_KERNEL_SYSCALL;
- event_notifier = _lttng_event_notifier_create(desc, user_token, group,
- &event_notifier_param, filter,
- event_notifier_param.event.instrumentation);
+ event_notifier = _lttng_event_notifier_create(desc, user_token,
+ error_counter_index, group, &event_notifier_param,
+ filter, event_notifier_param.event.instrumentation);
if (IS_ERR(event_notifier)) {
printk(KERN_INFO "Unable to create event_notifier %s\n",
desc->name);
}
event_notifier->u.syscall.syscall_id = i;
- event_notifier->u.syscall.is_compat = is_compat;
}
+
end:
return ret;
}
-int lttng_syscals_create_matching_event_notifiers(struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter)
+int lttng_syscals_create_matching_event_notifiers(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ void *filter)
{
int ret;
+ struct lttng_enabler *base_enabler =
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
+ enum lttng_kernel_syscall_entryexit entryexit =
+ base_enabler->event_param.u.syscall.entryexit;
+
+ if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) {
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ filter, sc_table, ARRAY_SIZE(sc_table), SC_TYPE_ENTRY);
+ if (ret)
+ goto end;
- ret = create_matching_event_notifiers(event_notifier_enabler, filter, sc_table,
- ARRAY_SIZE(sc_table), false);
- if (ret)
- goto end;
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ filter, compat_sc_table, ARRAY_SIZE(compat_sc_table),
+ SC_TYPE_COMPAT_ENTRY);
+ if (ret)
+ goto end;
+
+ ret = create_unknown_event_notifier(event_notifier_enabler,
+ SC_TYPE_ENTRY);
+ if (ret)
+ goto end;
+
+ ret = create_unknown_event_notifier(event_notifier_enabler,
+ SC_TYPE_COMPAT_ENTRY);
+ if (ret)
+ goto end;
+ }
+
+ if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) {
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ filter, sc_exit_table, ARRAY_SIZE(sc_exit_table),
+ SC_TYPE_EXIT);
+ if (ret)
+ goto end;
+
+ ret = create_unknown_event_notifier(event_notifier_enabler,
+ SC_TYPE_EXIT);
+ if (ret)
+ goto end;
+
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ filter, compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table),
+ SC_TYPE_COMPAT_EXIT);
+ if (ret)
+ goto end;
+
+ ret = create_unknown_event_notifier(event_notifier_enabler,
+ SC_TYPE_COMPAT_EXIT);
+ if (ret)
+ goto end;
+ }
- ret = create_matching_event_notifiers(event_notifier_enabler, filter, compat_sc_table,
- ARRAY_SIZE(compat_sc_table), true);
end:
return ret;
}
/*
* Unregister the syscall event_notifier probes from the callsites.
*/
-int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *event_notifier_group)
+int lttng_syscalls_unregister_event_notifier(
+ struct lttng_event_notifier_group *event_notifier_group)
{
int ret;
return ret;
event_notifier_group->sys_enter_registered = 0;
}
+ if (event_notifier_group->sys_exit_registered) {
+ ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit",
+ (void *) syscall_exit_event_notifier_probe, event_notifier_group);
+ if (ret)
+ return ret;
+ event_notifier_group->sys_enter_registered = 0;
+ }
kfree(event_notifier_group->event_notifier_syscall_dispatch);
+ kfree(event_notifier_group->event_notifier_exit_syscall_dispatch);
#ifdef CONFIG_COMPAT
kfree(event_notifier_group->event_notifier_compat_syscall_dispatch);
+ kfree(event_notifier_group->event_notifier_exit_compat_syscall_dispatch);
#endif
return 0;
}
}
static
-const char *get_syscall_name(struct lttng_event *event)
+const char *get_syscall_name(const char *desc_name,
+ enum lttng_syscall_abi abi,
+ enum lttng_syscall_entryexit entryexit)
{
size_t prefix_len = 0;
- WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL);
- switch (event->u.syscall.entryexit) {
+ switch (entryexit) {
case LTTNG_SYSCALL_ENTRY:
- switch (event->u.syscall.abi) {
+ switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
prefix_len = strlen(SYSCALL_ENTRY_STR);
break;
}
break;
case LTTNG_SYSCALL_EXIT:
- switch (event->u.syscall.abi) {
+ switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
prefix_len = strlen(SYSCALL_EXIT_STR);
break;
break;
}
WARN_ON_ONCE(prefix_len == 0);
- return event->desc->name + prefix_len;
+ return desc_name + prefix_len;
}
-int lttng_syscall_filter_enable_event(struct lttng_channel *chan,
- struct lttng_event *event)
+static
+int lttng_syscall_filter_enable(
+ struct lttng_syscall_filter *filter,
+ const char *desc_name, enum lttng_syscall_abi abi,
+ enum lttng_syscall_entryexit entryexit)
{
- struct lttng_syscall_filter *filter = chan->sc_filter;
const char *syscall_name;
unsigned long *bitmap;
int syscall_nr;
- WARN_ON_ONCE(!chan->sc_table);
+ syscall_name = get_syscall_name(desc_name, abi, entryexit);
- syscall_name = get_syscall_name(event);
-
- switch (event->u.syscall.abi) {
+ switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
syscall_nr = get_syscall_nr(syscall_name);
break;
if (syscall_nr < 0)
return -ENOENT;
- switch (event->u.syscall.entryexit) {
+ switch (entryexit) {
case LTTNG_SYSCALL_ENTRY:
- switch (event->u.syscall.abi) {
+ switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
bitmap = filter->sc_entry;
break;
}
break;
case LTTNG_SYSCALL_EXIT:
- switch (event->u.syscall.abi) {
+ switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
bitmap = filter->sc_exit;
break;
}
int lttng_syscall_filter_enable_event_notifier(
- struct lttng_event_notifier *event_notifier)
+ struct lttng_event_notifier *notifier)
{
- struct lttng_event_notifier_group *group = event_notifier->group;
- unsigned int syscall_id = event_notifier->u.syscall.syscall_id;
- struct list_head *dispatch_list;
+ struct lttng_event_notifier_group *group = notifier->group;
+ unsigned int syscall_id = notifier->u.syscall.syscall_id;
+ struct hlist_head *dispatch_list;
+ int ret = 0;
- if (event_notifier->u.syscall.is_compat)
- dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id];
- else
- dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id];
+ WARN_ON_ONCE(notifier->instrumentation != LTTNG_KERNEL_SYSCALL);
- list_add_rcu(&event_notifier->u.syscall.node, dispatch_list);
+ ret = lttng_syscall_filter_enable(group->sc_filter,
+ notifier->desc->name, notifier->u.syscall.abi,
+ notifier->u.syscall.entryexit);
+ if (ret) {
+ goto end;
+ }
- return 0;
+ switch (notifier->u.syscall.entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (notifier->u.syscall.abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id];
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id];
+ break;
+ }
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (notifier->u.syscall.abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id];
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id];
+ break;
+ }
+ break;
+ }
+
+ hlist_add_head_rcu(¬ifier->u.syscall.node, dispatch_list);
+
+end:
+ return ret ;
}
-int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
+int lttng_syscall_filter_enable_event(
+ struct lttng_channel *channel,
struct lttng_event *event)
{
- struct lttng_syscall_filter *filter = chan->sc_filter;
+ WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL);
+
+ return lttng_syscall_filter_enable(channel->sc_filter,
+ event->desc->name, event->u.syscall.abi,
+ event->u.syscall.entryexit);
+}
+
+static
+int lttng_syscall_filter_disable(
+ struct lttng_syscall_filter *filter,
+ const char *desc_name, enum lttng_syscall_abi abi,
+ enum lttng_syscall_entryexit entryexit)
+{
const char *syscall_name;
unsigned long *bitmap;
int syscall_nr;
- WARN_ON_ONCE(!chan->sc_table);
+ syscall_name = get_syscall_name(desc_name, abi, entryexit);
- syscall_name = get_syscall_name(event);
-
- switch (event->u.syscall.abi) {
+ switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
syscall_nr = get_syscall_nr(syscall_name);
break;
if (syscall_nr < 0)
return -ENOENT;
- switch (event->u.syscall.entryexit) {
+ switch (entryexit) {
case LTTNG_SYSCALL_ENTRY:
- switch (event->u.syscall.abi) {
+ switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
bitmap = filter->sc_entry;
break;
}
break;
case LTTNG_SYSCALL_EXIT:
- switch (event->u.syscall.abi) {
+ switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
bitmap = filter->sc_exit;
break;
}
int lttng_syscall_filter_disable_event_notifier(
- struct lttng_event_notifier *event_notifier)
+ struct lttng_event_notifier *notifier)
{
- list_del_rcu(&event_notifier->u.syscall.node);
+ struct lttng_event_notifier_group *group = notifier->group;
+ int ret;
+
+ WARN_ON_ONCE(notifier->instrumentation != LTTNG_KERNEL_SYSCALL);
+
+ ret = lttng_syscall_filter_disable(group->sc_filter,
+ notifier->desc->name, notifier->u.syscall.abi,
+ notifier->u.syscall.entryexit);
+ WARN_ON_ONCE(ret != 0);
+
+ hlist_del_rcu(¬ifier->u.syscall.node);
return 0;
}
+int lttng_syscall_filter_disable_event(
+ struct lttng_channel *channel,
+ struct lttng_event *event)
+{
+ return lttng_syscall_filter_disable(channel->sc_filter,
+ event->desc->name, event->u.syscall.abi,
+ event->u.syscall.entryexit);
+}
+
static
const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos)
{
projects / lttng-modules.git / blobdiff