#include <wrapper/rcu.h>
#include <wrapper/syscall.h>
#include <lttng/events.h>
+#include <lttng/events-internal.h>
+#include <lttng/utils.h>
+
+#include "lttng-syscalls.h"
#ifndef CONFIG_COMPAT
# ifndef is_compat_task
#define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK)
#define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK)
-static
-void syscall_entry_probe(void *__data, struct pt_regs *regs, long id);
-static
-void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret);
+void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id);
+void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret);
/*
* Forward declarations for old kernels.
struct itimerval;
struct itimerspec;
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0))
typedef __kernel_old_time_t time_t;
#endif
#include <instrumentation/syscalls/headers/syscalls_unknown.h>
#undef TRACE_SYSTEM
-#define SC_ENTER
-
-#undef sc_exit
-#define sc_exit(...)
-#undef sc_in
-#define sc_in(...) __VA_ARGS__
-#undef sc_out
-#define sc_out(...)
-#undef sc_inout
-#define sc_inout(...) __VA_ARGS__
-
-/* Hijack probe callback for system call enter */
-#undef TP_PROBE_CB
-#define TP_PROBE_CB(_template) &syscall_entry_probe
-#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
- LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_fields))
-#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
- LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_locvar), PARAMS(_code_pre), \
- PARAMS(_fields), PARAMS(_code_post))
-#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
- LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields))
-#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
- LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name)
-/* Enumerations only defined at first inclusion. */
-#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \
- LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values))
-#undef TRACE_SYSTEM
-#define TRACE_SYSTEM syscall_entry_integers
-#define TRACE_INCLUDE_FILE syscalls_integers
-#include <instrumentation/syscalls/headers/syscalls_integers.h>
-#undef TRACE_INCLUDE_FILE
-#undef TRACE_SYSTEM
-#define TRACE_SYSTEM syscall_entry_pointers
-#define TRACE_INCLUDE_FILE syscalls_pointers
-#include <instrumentation/syscalls/headers/syscalls_pointers.h>
-#undef TRACE_INCLUDE_FILE
-#undef TRACE_SYSTEM
-#undef SC_LTTNG_TRACEPOINT_ENUM
-#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
-#undef SC_LTTNG_TRACEPOINT_EVENT
-#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
-#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
-#undef TP_PROBE_CB
-#undef _TRACE_SYSCALLS_INTEGERS_H
-#undef _TRACE_SYSCALLS_POINTERS_H
-
-/* Hijack probe callback for compat system call enter */
-#define TP_PROBE_CB(_template) &syscall_entry_probe
-#define LTTNG_SC_COMPAT
-#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
- LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_fields))
-#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
- LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
-#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
- LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields))
-#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
- LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \
- compat_syscall_entry_##_name)
-/* Enumerations only defined at inital inclusion (not here). */
-#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
-#define TRACE_SYSTEM compat_syscall_entry_integers
-#define TRACE_INCLUDE_FILE compat_syscalls_integers
-#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
-#undef TRACE_INCLUDE_FILE
-#undef TRACE_SYSTEM
-#define TRACE_SYSTEM compat_syscall_entry_pointers
-#define TRACE_INCLUDE_FILE compat_syscalls_pointers
-#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
-#undef TRACE_INCLUDE_FILE
-#undef TRACE_SYSTEM
-#undef SC_LTTNG_TRACEPOINT_ENUM
-#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
-#undef SC_LTTNG_TRACEPOINT_EVENT
-#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
-#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
#undef TP_PROBE_CB
-#undef _TRACE_SYSCALLS_INTEGERS_H
-#undef _TRACE_SYSCALLS_POINTERS_H
-#undef LTTNG_SC_COMPAT
-
-#undef SC_ENTER
-
-#define SC_EXIT
-
-#undef sc_exit
-#define sc_exit(...) __VA_ARGS__
-#undef sc_in
-#define sc_in(...)
-#undef sc_out
-#define sc_out(...) __VA_ARGS__
-#undef sc_inout
-#define sc_inout(...) __VA_ARGS__
-
-/* Hijack probe callback for system call exit */
-#define TP_PROBE_CB(_template) &syscall_exit_probe
-#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
- LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_fields))
-#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
- LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
-#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
- LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields))
-#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
- LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \
- syscall_exit_##_name)
-/* Enumerations only defined at inital inclusion (not here). */
-#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
-#define TRACE_SYSTEM syscall_exit_integers
-#define TRACE_INCLUDE_FILE syscalls_integers
-#include <instrumentation/syscalls/headers/syscalls_integers.h>
-#undef TRACE_INCLUDE_FILE
-#undef TRACE_SYSTEM
-#define TRACE_SYSTEM syscall_exit_pointers
-#define TRACE_INCLUDE_FILE syscalls_pointers
-#include <instrumentation/syscalls/headers/syscalls_pointers.h>
-#undef TRACE_INCLUDE_FILE
-#undef TRACE_SYSTEM
-#undef SC_LTTNG_TRACEPOINT_ENUM
-#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
-#undef SC_LTTNG_TRACEPOINT_EVENT
-#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
-#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
-#undef TP_PROBE_CB
-#undef _TRACE_SYSCALLS_INTEGERS_H
-#undef _TRACE_SYSCALLS_POINTERS_H
-
-
-/* Hijack probe callback for compat system call exit */
-#define TP_PROBE_CB(_template) &syscall_exit_probe
-#define LTTNG_SC_COMPAT
-#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
- LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_fields))
-#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
- LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
-#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
- LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields))
-#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
- LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \
- compat_syscall_exit_##_name)
-/* Enumerations only defined at inital inclusion (not here). */
-#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
-#define TRACE_SYSTEM compat_syscall_exit_integers
-#define TRACE_INCLUDE_FILE compat_syscalls_integers
-#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
-#undef TRACE_INCLUDE_FILE
-#undef TRACE_SYSTEM
-#define TRACE_SYSTEM compat_syscall_exit_pointers
-#define TRACE_INCLUDE_FILE compat_syscalls_pointers
-#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
-#undef TRACE_INCLUDE_FILE
-#undef TRACE_SYSTEM
-#undef SC_LTTNG_TRACEPOINT_ENUM
-#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
-#undef SC_LTTNG_TRACEPOINT_EVENT
-#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
-#undef SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
-#undef TP_PROBE_CB
-#undef _TRACE_SYSCALLS_INTEGERS_H
-#undef _TRACE_SYSCALLS_POINTERS_H
-#undef LTTNG_SC_COMPAT
-
-#undef SC_EXIT
-
-#undef TP_MODULE_NOINIT
-#undef LTTNG_PACKAGE_BUILD
-#undef CREATE_TRACE_POINTS
-
-struct trace_syscall_entry {
- void *func;
- const struct lttng_event_desc *desc;
- const struct lttng_event_field *fields;
- unsigned int nrargs;
-};
-#define CREATE_SYSCALL_TABLE
+extern const struct trace_syscall_table sc_table;
+extern const struct trace_syscall_table compat_sc_table;
-#define SC_ENTER
+/* Event syscall exit table */
+extern const struct trace_syscall_table sc_exit_table;
+extern const struct trace_syscall_table compat_sc_exit_table;
-#undef sc_exit
-#define sc_exit(...)
-
-#undef TRACE_SYSCALL_TABLE
-#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
- [ _nr ] = { \
- .func = __event_probe__syscall_entry_##_template, \
- .nrargs = (_nrargs), \
- .fields = __event_fields___syscall_entry_##_template, \
- .desc = &__event_desc___syscall_entry_##_name, \
- },
-
-/* Syscall enter tracing table */
-static const struct trace_syscall_entry sc_table[] = {
-#include <instrumentation/syscalls/headers/syscalls_integers.h>
-#include <instrumentation/syscalls/headers/syscalls_pointers.h>
-};
-
-#undef TRACE_SYSCALL_TABLE
-#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
- [ _nr ] = { \
- .func = __event_probe__compat_syscall_entry_##_template, \
- .nrargs = (_nrargs), \
- .fields = __event_fields___compat_syscall_entry_##_template, \
- .desc = &__event_desc___compat_syscall_entry_##_name, \
- },
-
-/* Compat syscall enter table */
-const struct trace_syscall_entry compat_sc_table[] = {
-#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
-#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
-};
-
-#undef SC_ENTER
-
-#define SC_EXIT
-
-#undef sc_exit
-#define sc_exit(...) __VA_ARGS__
-
-#undef TRACE_SYSCALL_TABLE
-#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
- [ _nr ] = { \
- .func = __event_probe__syscall_exit_##_template, \
- .nrargs = (_nrargs), \
- .fields = __event_fields___syscall_exit_##_template, \
- .desc = &__event_desc___syscall_exit_##_name, \
- },
-
-/* Syscall exit table */
-static const struct trace_syscall_entry sc_exit_table[] = {
-#include <instrumentation/syscalls/headers/syscalls_integers.h>
-#include <instrumentation/syscalls/headers/syscalls_pointers.h>
-};
-
-#undef TRACE_SYSCALL_TABLE
-#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
- [ _nr ] = { \
- .func = __event_probe__compat_syscall_exit_##_template, \
- .nrargs = (_nrargs), \
- .fields = __event_fields___compat_syscall_exit_##_template, \
- .desc = &__event_desc___compat_syscall_exit_##_name, \
- },
-
-/* Compat syscall exit table */
-const struct trace_syscall_entry compat_sc_exit_table[] = {
-#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
-#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
-};
#undef SC_EXIT
#undef CREATE_SYSCALL_TABLE
struct lttng_syscall_filter {
- DECLARE_BITMAP(sc, NR_syscalls);
- DECLARE_BITMAP(sc_compat, NR_compat_syscalls);
+ DECLARE_BITMAP(sc_entry, NR_syscalls);
+ DECLARE_BITMAP(sc_exit, NR_syscalls);
+ DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls);
+ DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls);
};
-static void syscall_entry_unknown(struct lttng_event *event,
- struct pt_regs *regs, unsigned int id)
+static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head,
+ struct pt_regs *regs, long id)
{
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+ struct lttng_kernel_event_common_private *event_priv;
lttng_syscall_get_arguments(current, regs, args);
- if (unlikely(in_compat_syscall()))
- __event_probe__compat_syscall_entry_unknown(event, id, args);
- else
- __event_probe__syscall_entry_unknown(event, id, args);
+ lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) {
+ if (unlikely(in_compat_syscall()))
+ __event_probe__compat_syscall_entry_unknown(event_priv->pub, id, args);
+ else
+ __event_probe__syscall_entry_unknown(event_priv->pub, id, args);
+ }
}
-void syscall_entry_probe(void *__data, struct pt_regs *regs, long id)
+static __always_inline
+void syscall_entry_event_call_func(struct hlist_head *action_list,
+ void *func, unsigned int nrargs,
+ struct pt_regs *regs)
{
- struct lttng_channel *chan = __data;
- struct lttng_event *event, *unknown_event;
- const struct trace_syscall_entry *table, *entry;
- size_t table_len;
-
- if (unlikely(in_compat_syscall())) {
- struct lttng_syscall_filter *filter;
-
- filter = lttng_rcu_dereference(chan->sc_filter);
- if (filter) {
- if (id < 0 || id >= NR_compat_syscalls
- || !test_bit(id, filter->sc_compat)) {
- /* System call filtered out. */
- return;
- }
- }
- table = compat_sc_table;
- table_len = ARRAY_SIZE(compat_sc_table);
- unknown_event = chan->sc_compat_unknown;
- } else {
- struct lttng_syscall_filter *filter;
-
- filter = lttng_rcu_dereference(chan->sc_filter);
- if (filter) {
- if (id < 0 || id >= NR_syscalls
- || !test_bit(id, filter->sc)) {
- /* System call filtered out. */
- return;
- }
- }
- table = sc_table;
- table_len = ARRAY_SIZE(sc_table);
- unknown_event = chan->sc_unknown;
- }
- if (unlikely(id < 0 || id >= table_len)) {
- syscall_entry_unknown(unknown_event, regs, id);
- return;
- }
- if (unlikely(in_compat_syscall()))
- event = chan->compat_sc_table[id];
- else
- event = chan->sc_table[id];
- if (unlikely(!event)) {
- syscall_entry_unknown(unknown_event, regs, id);
- return;
- }
- entry = &table[id];
- WARN_ON_ONCE(!entry);
+ struct lttng_kernel_event_common_private *event_priv;
- switch (entry->nrargs) {
+ switch (nrargs) {
case 0:
{
- void (*fptr)(void *__data) = entry->func;
+ void (*fptr)(void *__data) = func;
- fptr(event);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub);
break;
}
case 1:
{
- void (*fptr)(void *__data, unsigned long arg0) = entry->func;
+ void (*fptr)(void *__data, unsigned long arg0) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, args[0]);
break;
}
case 2:
{
void (*fptr)(void *__data,
unsigned long arg0,
- unsigned long arg1) = entry->func;
+ unsigned long arg1) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0], args[1]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, args[0], args[1]);
break;
}
case 3:
void (*fptr)(void *__data,
unsigned long arg0,
unsigned long arg1,
- unsigned long arg2) = entry->func;
+ unsigned long arg2) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0], args[1], args[2]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, args[0], args[1], args[2]);
break;
}
case 4:
unsigned long arg0,
unsigned long arg1,
unsigned long arg2,
- unsigned long arg3) = entry->func;
+ unsigned long arg3) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0], args[1], args[2], args[3]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, args[0], args[1], args[2], args[3]);
break;
}
case 5:
unsigned long arg1,
unsigned long arg2,
unsigned long arg3,
- unsigned long arg4) = entry->func;
+ unsigned long arg4) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0], args[1], args[2], args[3], args[4]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, args[0], args[1], args[2], args[3], args[4]);
break;
}
case 6:
unsigned long arg2,
unsigned long arg3,
unsigned long arg4,
- unsigned long arg5) = entry->func;
+ unsigned long arg5) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0], args[1], args[2],
- args[3], args[4], args[5]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, args[0], args[1], args[2],
+ args[3], args[4], args[5]);
break;
}
default:
}
}
-static void syscall_exit_unknown(struct lttng_event *event,
- struct pt_regs *regs, int id, long ret)
-{
- unsigned long args[LTTNG_SYSCALL_NR_ARGS];
-
- lttng_syscall_get_arguments(current, regs, args);
- if (unlikely(in_compat_syscall()))
- __event_probe__compat_syscall_exit_unknown(event, id, ret,
- args);
- else
- __event_probe__syscall_exit_unknown(event, id, ret, args);
-}
-
-void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret)
+void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id)
{
- struct lttng_channel *chan = __data;
- struct lttng_event *event, *unknown_event;
+ struct lttng_kernel_syscall_table *syscall_table = __data;
+ struct hlist_head *action_list, *unknown_action_list;
const struct trace_syscall_entry *table, *entry;
size_t table_len;
- long id;
- id = syscall_get_nr(current, regs);
if (unlikely(in_compat_syscall())) {
- struct lttng_syscall_filter *filter;
-
- filter = lttng_rcu_dereference(chan->sc_filter);
- if (filter) {
- if (id < 0 || id >= NR_compat_syscalls
- || !test_bit(id, filter->sc_compat)) {
- /* System call filtered out. */
- return;
- }
+ struct lttng_syscall_filter *filter = syscall_table->sc_filter;
+
+ if (id < 0 || id >= NR_compat_syscalls
+ || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_compat_entry))) {
+ /* System call filtered out. */
+ return;
}
- table = compat_sc_exit_table;
- table_len = ARRAY_SIZE(compat_sc_exit_table);
- unknown_event = chan->compat_sc_exit_unknown;
+ table = compat_sc_table.table;
+ table_len = compat_sc_table.len;
+ unknown_action_list = &syscall_table->compat_unknown_syscall_dispatch;
} else {
- struct lttng_syscall_filter *filter;
-
- filter = lttng_rcu_dereference(chan->sc_filter);
- if (filter) {
- if (id < 0 || id >= NR_syscalls
- || !test_bit(id, filter->sc)) {
- /* System call filtered out. */
- return;
- }
+ struct lttng_syscall_filter *filter = syscall_table->sc_filter;
+
+ if (id < 0 || id >= NR_syscalls
+ || (!READ_ONCE(syscall_table->syscall_all_entry) && !test_bit(id, filter->sc_entry))) {
+ /* System call filtered out. */
+ return;
}
- table = sc_exit_table;
- table_len = ARRAY_SIZE(sc_exit_table);
- unknown_event = chan->sc_exit_unknown;
+ table = sc_table.table;
+ table_len = sc_table.len;
+ unknown_action_list = &syscall_table->unknown_syscall_dispatch;
}
if (unlikely(id < 0 || id >= table_len)) {
- syscall_exit_unknown(unknown_event, regs, id, ret);
+ syscall_entry_event_unknown(unknown_action_list, regs, id);
return;
}
- if (unlikely(in_compat_syscall()))
- event = chan->compat_sc_exit_table[id];
- else
- event = chan->sc_exit_table[id];
- if (unlikely(!event)) {
- syscall_exit_unknown(unknown_event, regs, id, ret);
+
+ entry = &table[id];
+ if (!entry->event_func) {
+ syscall_entry_event_unknown(unknown_action_list, regs, id);
return;
}
- entry = &table[id];
- WARN_ON_ONCE(!entry);
- switch (entry->nrargs) {
+ if (unlikely(in_compat_syscall())) {
+ action_list = &syscall_table->compat_syscall_dispatch[id];
+ } else {
+ action_list = &syscall_table->syscall_dispatch[id];
+ }
+ if (unlikely(hlist_empty(action_list)))
+ return;
+
+ syscall_entry_event_call_func(action_list, entry->event_func, entry->nrargs, regs);
+}
+
+static void syscall_exit_event_unknown(struct hlist_head *unknown_action_list_head,
+ struct pt_regs *regs, long id, long ret)
+{
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+ struct lttng_kernel_event_common_private *event_priv;
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(event_priv, unknown_action_list_head, u.syscall.node) {
+ if (unlikely(in_compat_syscall()))
+ __event_probe__compat_syscall_exit_unknown(event_priv->pub, id, ret,
+ args);
+ else
+ __event_probe__syscall_exit_unknown(event_priv->pub, id, ret, args);
+ }
+}
+
+static __always_inline
+void syscall_exit_event_call_func(struct hlist_head *action_list,
+ void *func, unsigned int nrargs,
+ struct pt_regs *regs, long ret)
+{
+ struct lttng_kernel_event_common_private *event_priv;
+
+ switch (nrargs) {
case 0:
{
- void (*fptr)(void *__data, long ret) = entry->func;
+ void (*fptr)(void *__data, long ret) = func;
- fptr(event, ret);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, ret);
break;
}
case 1:
{
void (*fptr)(void *__data,
long ret,
- unsigned long arg0) = entry->func;
+ unsigned long arg0) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, ret, args[0]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, ret, args[0]);
break;
}
case 2:
void (*fptr)(void *__data,
long ret,
unsigned long arg0,
- unsigned long arg1) = entry->func;
+ unsigned long arg1) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, ret, args[0], args[1]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, ret, args[0], args[1]);
break;
}
case 3:
long ret,
unsigned long arg0,
unsigned long arg1,
- unsigned long arg2) = entry->func;
+ unsigned long arg2) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, ret, args[0], args[1], args[2]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, ret, args[0], args[1], args[2]);
break;
}
case 4:
unsigned long arg0,
unsigned long arg1,
unsigned long arg2,
- unsigned long arg3) = entry->func;
+ unsigned long arg3) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, ret, args[0], args[1], args[2], args[3]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3]);
break;
}
case 5:
unsigned long arg1,
unsigned long arg2,
unsigned long arg3,
- unsigned long arg4) = entry->func;
+ unsigned long arg4) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, ret, args[0], args[1], args[2], args[3], args[4]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, ret, args[0], args[1], args[2], args[3], args[4]);
break;
}
case 6:
unsigned long arg2,
unsigned long arg3,
unsigned long arg4,
- unsigned long arg5) = entry->func;
+ unsigned long arg5) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, ret, args[0], args[1], args[2],
- args[3], args[4], args[5]);
+ lttng_hlist_for_each_entry_rcu(event_priv, action_list, u.syscall.node)
+ fptr(event_priv->pub, ret, args[0], args[1], args[2],
+ args[3], args[4], args[5]);
break;
}
default:
}
}
+void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret)
+{
+ struct lttng_kernel_syscall_table *syscall_table = __data;
+ struct hlist_head *action_list, *unknown_action_list;
+ const struct trace_syscall_entry *table, *entry;
+ size_t table_len;
+ long id;
+
+ id = syscall_get_nr(current, regs);
+
+ if (unlikely(in_compat_syscall())) {
+ struct lttng_syscall_filter *filter = syscall_table->sc_filter;
+
+ if (id < 0 || id >= NR_compat_syscalls
+ || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_compat_exit))) {
+ /* System call filtered out. */
+ return;
+ }
+ table = compat_sc_exit_table.table;
+ table_len = compat_sc_exit_table.len;
+ unknown_action_list = &syscall_table->compat_unknown_syscall_exit_dispatch;
+ } else {
+ struct lttng_syscall_filter *filter = syscall_table->sc_filter;
+
+ if (id < 0 || id >= NR_syscalls
+ || (!READ_ONCE(syscall_table->syscall_all_exit) && !test_bit(id, filter->sc_exit))) {
+ /* System call filtered out. */
+ return;
+ }
+ table = sc_exit_table.table;
+ table_len = sc_exit_table.len;
+ unknown_action_list = &syscall_table->unknown_syscall_exit_dispatch;
+ }
+ if (unlikely(id < 0 || id >= table_len)) {
+ syscall_exit_event_unknown(unknown_action_list, regs, id, ret);
+ return;
+ }
+
+ entry = &table[id];
+ if (!entry->event_func) {
+ syscall_exit_event_unknown(unknown_action_list, regs, id, ret);
+ return;
+ }
+
+ if (unlikely(in_compat_syscall())) {
+ action_list = &syscall_table->compat_syscall_exit_dispatch[id];
+ } else {
+ action_list = &syscall_table->syscall_exit_dispatch[id];
+ }
+ if (unlikely(hlist_empty(action_list)))
+ return;
+
+ syscall_exit_event_call_func(action_list, entry->event_func, entry->nrargs,
+ regs, ret);
+}
+
+static
+struct lttng_kernel_syscall_table *get_syscall_table_from_enabler(struct lttng_event_enabler_common *event_enabler)
+{
+ switch (event_enabler->enabler_type) {
+ case LTTNG_EVENT_ENABLER_TYPE_RECORDER:
+ {
+ struct lttng_event_recorder_enabler *event_recorder_enabler =
+ container_of(event_enabler, struct lttng_event_recorder_enabler, parent);
+ return &event_recorder_enabler->chan->priv->parent.syscall_table;
+ }
+ case LTTNG_EVENT_ENABLER_TYPE_NOTIFIER:
+ {
+ struct lttng_event_notifier_enabler *event_notifier_enabler =
+ container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
+ return &event_notifier_enabler->group->syscall_table;
+ }
+ default:
+ return NULL;
+ }
+}
+
+static
+struct lttng_kernel_syscall_table *get_syscall_table_from_event(struct lttng_kernel_event_common *event)
+{
+ switch (event->type) {
+ case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
+ {
+ struct lttng_kernel_event_recorder *event_recorder =
+ container_of(event, struct lttng_kernel_event_recorder, parent);
+ return &event_recorder->chan->priv->parent.syscall_table;
+ }
+ case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
+ {
+ struct lttng_kernel_event_notifier *event_notifier =
+ container_of(event, struct lttng_kernel_event_notifier, parent);
+ return &event_notifier->priv->group->syscall_table;
+ }
+ default:
+ return NULL;
+ }
+}
+
/*
* noinline to diminish caller stack size.
* Should be called with sessions lock held.
*/
static
-int fill_table(const struct trace_syscall_entry *table, size_t table_len,
- struct lttng_event **chan_table, struct lttng_channel *chan,
- void *filter, enum sc_type type)
+int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len,
+ struct hlist_head *chan_table, struct lttng_event_recorder_enabler *syscall_event_enabler,
+ enum sc_type type)
{
- const struct lttng_event_desc *desc;
+ struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(&syscall_event_enabler->parent);
+ struct lttng_kernel_channel_buffer *chan = syscall_event_enabler->chan;
+ struct lttng_kernel_session *session = chan->parent.session;
unsigned int i;
- /* Allocate events for each syscall, insert into table */
+ /* Allocate events for each syscall matching enabler, insert into table */
for (i = 0; i < table_len; i++) {
- struct lttng_kernel_event ev;
- desc = table[i].desc;
+ const struct lttng_kernel_event_desc *desc = table[i].desc;
+ struct lttng_event_recorder_enabler *event_enabler;
+ struct lttng_kernel_abi_event ev;
+ struct lttng_kernel_event_recorder_private *event_recorder_priv;
+ struct lttng_kernel_event_recorder *event_recorder;
+ struct hlist_head *head;
+ bool found = false;
if (!desc) {
/* Unknown syscall */
continue;
}
+ if (lttng_desc_match_enabler(desc,
+ lttng_event_recorder_enabler_as_enabler(syscall_event_enabler)) <= 0)
+ continue;
/*
- * Skip those already populated by previous failed
- * register for this channel.
+ * Check if already created.
*/
- if (chan_table[i])
+ head = utils_borrow_hash_table_bucket(
+ session->priv->events_ht.table, LTTNG_EVENT_HT_SIZE,
+ desc->event_name);
+ lttng_hlist_for_each_entry(event_recorder_priv, head, hlist) {
+ if (event_recorder_priv->parent.desc == desc
+ && get_syscall_table_from_event(event_recorder_priv->parent.pub) == syscall_table)
+ found = true;
+ }
+ if (found)
continue;
+
+ /* We need to create an event for this syscall/enabler. */
memset(&ev, 0, sizeof(ev));
switch (type) {
case SC_TYPE_ENTRY:
- strncpy(ev.name, SYSCALL_ENTRY_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY;
+ ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE;
break;
case SC_TYPE_EXIT:
- strncpy(ev.name, SYSCALL_EXIT_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT;
+ ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE;
break;
case SC_TYPE_COMPAT_ENTRY:
- strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY;
+ ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT;
break;
case SC_TYPE_COMPAT_EXIT:
- strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
- break;
- default:
- BUG_ON(1);
+ ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT;
+ ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT;
break;
}
- strncat(ev.name, desc->name,
- LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1);
- ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_SYSCALL;
- chan_table[i] = _lttng_event_create(chan, &ev, filter,
- desc, ev.instrumentation);
- WARN_ON_ONCE(!chan_table[i]);
- if (IS_ERR(chan_table[i])) {
+ strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1);
+ ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL;
+ event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan);
+ if (!event_enabler) {
+ return -ENOMEM;
+ }
+ event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc);
+ WARN_ON_ONCE(!event_recorder);
+ lttng_event_enabler_destroy(&event_enabler->parent);
+ if (IS_ERR(event_recorder)) {
/*
* If something goes wrong in event registration
* after the first one, we have no choice but to
* leave the previous events in there, until
* deleted by session teardown.
*/
- return PTR_ERR(chan_table[i]);
+ return PTR_ERR(event_recorder);
}
+ hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &chan_table[i]);
}
return 0;
}
/*
* Should be called with sessions lock held.
*/
-int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
+int lttng_syscalls_register_event_recorder(struct lttng_event_recorder_enabler *syscall_event_enabler)
{
- struct lttng_kernel_event ev;
+ struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(&syscall_event_enabler->parent);
+ struct lttng_kernel_abi_event ev;
int ret;
wrapper_vmalloc_sync_mappings();
- if (!chan->sc_table) {
+ if (!syscall_table->syscall_dispatch) {
/* create syscall table mapping syscall to events */
- chan->sc_table = kzalloc(sizeof(struct lttng_event *)
- * ARRAY_SIZE(sc_table), GFP_KERNEL);
- if (!chan->sc_table)
+ syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL);
+ if (!syscall_table->syscall_dispatch)
return -ENOMEM;
}
- if (!chan->sc_exit_table) {
+ if (!syscall_table->syscall_exit_dispatch) {
/* create syscall table mapping syscall to events */
- chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *)
- * ARRAY_SIZE(sc_exit_table), GFP_KERNEL);
- if (!chan->sc_exit_table)
+ syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_exit_table.len, GFP_KERNEL);
+ if (!syscall_table->syscall_exit_dispatch)
return -ENOMEM;
}
#ifdef CONFIG_COMPAT
- if (!chan->compat_sc_table) {
+ if (!syscall_table->compat_syscall_dispatch) {
/* create syscall table mapping compat syscall to events */
- chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *)
- * ARRAY_SIZE(compat_sc_table), GFP_KERNEL);
- if (!chan->compat_sc_table)
+ syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL);
+ if (!syscall_table->compat_syscall_dispatch)
return -ENOMEM;
}
- if (!chan->compat_sc_exit_table) {
+ if (!syscall_table->compat_syscall_exit_dispatch) {
/* create syscall table mapping compat syscall to events */
- chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *)
- * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL);
- if (!chan->compat_sc_exit_table)
+ syscall_table->compat_syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len, GFP_KERNEL);
+ if (!syscall_table->compat_syscall_exit_dispatch)
return -ENOMEM;
}
#endif
- if (!chan->sc_unknown) {
- const struct lttng_event_desc *desc =
+ if (hlist_empty(&syscall_table->unknown_syscall_dispatch)) {
+ const struct lttng_kernel_event_desc *desc =
&__event_desc___syscall_entry_unknown;
+ struct lttng_kernel_event_recorder *event_recorder;
+ struct lttng_event_recorder_enabler *event_enabler;
memset(&ev, 0, sizeof(ev));
- strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
- ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_SYSCALL;
- chan->sc_unknown = _lttng_event_create(chan, &ev, filter,
- desc,
- ev.instrumentation);
- WARN_ON_ONCE(!chan->sc_unknown);
- if (IS_ERR(chan->sc_unknown)) {
- return PTR_ERR(chan->sc_unknown);
+ strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN);
+ ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL;
+ ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY;
+ ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE;
+ event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, syscall_event_enabler->chan);
+ if (!event_enabler) {
+ return -ENOMEM;
}
+ event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc);
+ lttng_event_enabler_destroy(&event_enabler->parent);
+ WARN_ON_ONCE(!event_recorder);
+ if (IS_ERR(event_recorder)) {
+ return PTR_ERR(event_recorder);
+ }
+ hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->unknown_syscall_dispatch);
}
- if (!chan->sc_compat_unknown) {
- const struct lttng_event_desc *desc =
+ if (hlist_empty(&syscall_table->compat_unknown_syscall_dispatch)) {
+ const struct lttng_kernel_event_desc *desc =
&__event_desc___compat_syscall_entry_unknown;
+ struct lttng_kernel_event_recorder *event_recorder;
+ struct lttng_event_recorder_enabler *event_enabler;
memset(&ev, 0, sizeof(ev));
- strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
- ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_SYSCALL;
- chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter,
- desc,
- ev.instrumentation);
- WARN_ON_ONCE(!chan->sc_unknown);
- if (IS_ERR(chan->sc_compat_unknown)) {
- return PTR_ERR(chan->sc_compat_unknown);
+ strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN);
+ ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL;
+ ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY;
+ ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT;
+ event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, syscall_event_enabler->chan);
+ if (!event_enabler) {
+ return -ENOMEM;
+ }
+ event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc);
+ WARN_ON_ONCE(!event_recorder);
+ lttng_event_enabler_destroy(&event_enabler->parent);
+ if (IS_ERR(event_recorder)) {
+ return PTR_ERR(event_recorder);
}
+ hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->compat_unknown_syscall_dispatch);
}
- if (!chan->compat_sc_exit_unknown) {
- const struct lttng_event_desc *desc =
+ if (hlist_empty(&syscall_table->compat_unknown_syscall_exit_dispatch)) {
+ const struct lttng_kernel_event_desc *desc =
&__event_desc___compat_syscall_exit_unknown;
+ struct lttng_kernel_event_recorder *event_recorder;
+ struct lttng_event_recorder_enabler *event_enabler;
memset(&ev, 0, sizeof(ev));
- strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
- ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_SYSCALL;
- chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev,
- filter, desc,
- ev.instrumentation);
- WARN_ON_ONCE(!chan->compat_sc_exit_unknown);
- if (IS_ERR(chan->compat_sc_exit_unknown)) {
- return PTR_ERR(chan->compat_sc_exit_unknown);
+ strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN);
+ ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL;
+ ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT;
+ ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT;
+ event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, syscall_event_enabler->chan);
+ if (!event_enabler) {
+ return -ENOMEM;
+ }
+ event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc);
+ WARN_ON_ONCE(!event_recorder);
+ lttng_event_enabler_destroy(&event_enabler->parent);
+ if (IS_ERR(event_recorder)) {
+ return PTR_ERR(event_recorder);
}
+ hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->compat_unknown_syscall_exit_dispatch);
}
- if (!chan->sc_exit_unknown) {
- const struct lttng_event_desc *desc =
+ if (hlist_empty(&syscall_table->unknown_syscall_exit_dispatch)) {
+ const struct lttng_kernel_event_desc *desc =
&__event_desc___syscall_exit_unknown;
+ struct lttng_kernel_event_recorder *event_recorder;
+ struct lttng_event_recorder_enabler *event_enabler;
memset(&ev, 0, sizeof(ev));
- strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
- ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_SYSCALL;
- chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter,
- desc, ev.instrumentation);
- WARN_ON_ONCE(!chan->sc_exit_unknown);
- if (IS_ERR(chan->sc_exit_unknown)) {
- return PTR_ERR(chan->sc_exit_unknown);
+ strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN);
+ ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL;
+ ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT;
+ ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE;
+ event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, syscall_event_enabler->chan);
+ if (!event_enabler) {
+ return -ENOMEM;
}
+ event_recorder = _lttng_kernel_event_recorder_create(event_enabler, desc);
+ WARN_ON_ONCE(!event_recorder);
+ lttng_event_enabler_destroy(&event_enabler->parent);
+ if (IS_ERR(event_recorder)) {
+ return PTR_ERR(event_recorder);
+ }
+ hlist_add_head(&event_recorder->priv->parent.u.syscall.node, &syscall_table->unknown_syscall_exit_dispatch);
}
- ret = fill_table(sc_table, ARRAY_SIZE(sc_table),
- chan->sc_table, chan, filter, SC_TYPE_ENTRY);
+ ret = lttng_create_syscall_event_if_missing(sc_table.table, sc_table.len,
+ syscall_table->syscall_dispatch, syscall_event_enabler, SC_TYPE_ENTRY);
if (ret)
return ret;
- ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table),
- chan->sc_exit_table, chan, filter, SC_TYPE_EXIT);
+ ret = lttng_create_syscall_event_if_missing(sc_exit_table.table, sc_exit_table.len,
+ syscall_table->syscall_exit_dispatch, syscall_event_enabler, SC_TYPE_EXIT);
if (ret)
return ret;
#ifdef CONFIG_COMPAT
- ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table),
- chan->compat_sc_table, chan, filter,
- SC_TYPE_COMPAT_ENTRY);
+ ret = lttng_create_syscall_event_if_missing(compat_sc_table.table, compat_sc_table.len,
+ syscall_table->compat_syscall_dispatch, syscall_event_enabler, SC_TYPE_COMPAT_ENTRY);
if (ret)
return ret;
- ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table),
- chan->compat_sc_exit_table, chan, filter,
- SC_TYPE_COMPAT_EXIT);
+ ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table.table, compat_sc_exit_table.len,
+ syscall_table->compat_syscall_exit_dispatch, syscall_event_enabler, SC_TYPE_COMPAT_EXIT);
if (ret)
return ret;
#endif
- if (!chan->sys_enter_registered) {
+
+ if (!syscall_table->sc_filter) {
+ syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter),
+ GFP_KERNEL);
+ if (!syscall_table->sc_filter)
+ return -ENOMEM;
+ }
+
+ if (!syscall_table->sys_enter_registered) {
ret = lttng_wrapper_tracepoint_probe_register("sys_enter",
- (void *) syscall_entry_probe, chan);
+ (void *) syscall_entry_event_probe, syscall_table);
if (ret)
return ret;
- chan->sys_enter_registered = 1;
+ syscall_table->sys_enter_registered = 1;
}
/*
* We change the name of sys_exit tracepoint due to namespace
* conflict with sys_exit syscall entry.
*/
- if (!chan->sys_exit_registered) {
+ if (!syscall_table->sys_exit_registered) {
ret = lttng_wrapper_tracepoint_probe_register("sys_exit",
- (void *) syscall_exit_probe, chan);
+ (void *) syscall_exit_event_probe, syscall_table);
if (ret) {
WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
- (void *) syscall_entry_probe, chan));
+ (void *) syscall_entry_event_probe, syscall_table));
return ret;
}
- chan->sys_exit_registered = 1;
+ syscall_table->sys_exit_registered = 1;
}
return ret;
}
/*
- * Only called at session destruction.
+ * Should be called with sessions lock held.
*/
-int lttng_syscalls_unregister(struct lttng_channel *chan)
+int lttng_syscalls_register_event_notifier(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ struct lttng_event_notifier_group *group = event_notifier_enabler->group;
+ struct lttng_kernel_syscall_table *syscall_table = &group->syscall_table;
+ int ret = 0;
+
+ wrapper_vmalloc_sync_mappings();
+
+ if (!syscall_table->syscall_dispatch) {
+ syscall_table->syscall_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL);
+ if (!syscall_table->syscall_dispatch)
+ return -ENOMEM;
+ }
+
+ if (!syscall_table->syscall_exit_dispatch) {
+ syscall_table->syscall_exit_dispatch = kzalloc(sizeof(struct hlist_head) * sc_table.len, GFP_KERNEL);
+ if (!syscall_table->syscall_exit_dispatch)
+ return -ENOMEM;
+ }
+
+#ifdef CONFIG_COMPAT
+ if (!syscall_table->compat_syscall_dispatch) {
+ syscall_table->compat_syscall_dispatch = kzalloc(sizeof(struct hlist_head) * compat_sc_table.len, GFP_KERNEL);
+ if (!syscall_table->compat_syscall_dispatch)
+ return -ENOMEM;
+ }
+
+ if (!syscall_table->compat_syscall_exit_dispatch) {
+ syscall_table->compat_syscall_exit_dispatch =
+ kzalloc(sizeof(struct hlist_head) * compat_sc_exit_table.len,
+ GFP_KERNEL);
+ if (!syscall_table->compat_syscall_exit_dispatch)
+ return -ENOMEM;
+ }
+#endif
+
+ if (!syscall_table->sc_filter) {
+ syscall_table->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter),
+ GFP_KERNEL);
+ if (!syscall_table->sc_filter)
+ return -ENOMEM;
+ }
+
+ if (!syscall_table->sys_enter_registered) {
+ ret = lttng_wrapper_tracepoint_probe_register("sys_enter",
+ (void *) syscall_entry_event_probe, syscall_table);
+ if (ret)
+ return ret;
+ syscall_table->sys_enter_registered = 1;
+ }
+
+ if (!syscall_table->sys_exit_registered) {
+ ret = lttng_wrapper_tracepoint_probe_register("sys_exit",
+ (void *) syscall_exit_event_probe, syscall_table);
+ if (ret) {
+ WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
+ (void *) syscall_entry_event_probe, syscall_table));
+ return ret;
+ }
+ syscall_table->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_kernel_event_notifier_private *event_notifier_priv;
+ struct lttng_kernel_event_notifier *event_notifier;
+ const struct lttng_kernel_event_desc *desc;
+ struct lttng_event_notifier_group *group = event_notifier_enabler->group;
+ struct lttng_kernel_syscall_table *syscall_table = &group->syscall_table;
+ struct lttng_kernel_abi_event_notifier event_notifier_param;
+ uint64_t user_token = event_notifier_enabler->parent.user_token;
+ uint64_t error_counter_index = event_notifier_enabler->error_counter_index;
+ struct lttng_event_enabler_common *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_abi_syscall_abi abi;
+ enum lttng_kernel_abi_syscall_entryexit entryexit;
+ struct hlist_head *head;
+
+ switch (type) {
+ case SC_TYPE_ENTRY:
+ desc = &__event_desc___syscall_entry_unknown;
+ unknown_dispatch_list = &syscall_table->unknown_syscall_dispatch;
+ entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY;
+ abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_EXIT:
+ desc = &__event_desc___syscall_exit_unknown;
+ unknown_dispatch_list = &syscall_table->unknown_syscall_exit_dispatch;
+ entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT;
+ abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_COMPAT_ENTRY:
+ desc = &__event_desc___compat_syscall_entry_unknown;
+ unknown_dispatch_list = &syscall_table->compat_unknown_syscall_dispatch;
+ entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY;
+ abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT;
+ break;
+ case SC_TYPE_COMPAT_EXIT:
+ desc = &__event_desc___compat_syscall_exit_unknown;
+ unknown_dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch;
+ entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT;
+ abi = LTTNG_KERNEL_ABI_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->event_name);
+ lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
+ if (event_notifier_priv->parent.desc == desc &&
+ event_notifier_priv->parent.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->event_name,
+ LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1);
+
+ event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+
+ event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL;
+ event_notifier_param.event.u.syscall.abi = abi;
+ event_notifier_param.event.u.syscall.entryexit = entryexit;
+
+ event_notifier = _lttng_event_notifier_create(desc, user_token,
+ error_counter_index, group, &event_notifier_param,
+ event_notifier_param.event.instrumentation);
+ if (IS_ERR(event_notifier)) {
+ printk(KERN_INFO "Unable to create unknown notifier %s\n",
+ desc->event_name);
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, unknown_dispatch_list);
+
+end:
+ return ret;
+}
+
+static int create_matching_event_notifiers(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ const struct trace_syscall_entry *table,
+ size_t table_len, enum sc_type type)
+{
+ struct lttng_event_notifier_group *group = event_notifier_enabler->group;
+ const struct lttng_kernel_event_desc *desc;
+ uint64_t user_token = event_notifier_enabler->parent.user_token;
+ uint64_t error_counter_index = event_notifier_enabler->error_counter_index;
+ unsigned int i;
+ int ret = 0;
+
+ /* iterate over all syscall and create event_notifier that match */
+ for (i = 0; i < table_len; i++) {
+ struct lttng_kernel_event_notifier_private *event_notifier_priv;
+ struct lttng_kernel_event_notifier *event_notifier;
+ struct lttng_kernel_abi_event_notifier event_notifier_param;
+ struct hlist_head *head;
+ int found = 0;
+
+ desc = table[i].desc;
+ if (!desc) {
+ /* Unknown syscall */
+ continue;
+ }
+
+ if (!lttng_desc_match_enabler(desc,
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
+ continue;
+
+ /*
+ * Check if already created.
+ */
+ head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table,
+ LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->event_name);
+ lttng_hlist_for_each_entry(event_notifier_priv, head, hlist) {
+ if (event_notifier_priv->parent.desc == desc
+ && event_notifier_priv->parent.user_token == event_notifier_enabler->parent.user_token)
+ found = 1;
+ }
+ if (found)
+ 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_ABI_SYSCALL_ENTRY;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_EXIT:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_COMPAT_ENTRY:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT;
+ break;
+ case SC_TYPE_COMPAT_EXIT:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT;
+ break;
+ }
+ strncat(event_notifier_param.event.name, desc->event_name,
+ LTTNG_KERNEL_ABI_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1);
+ event_notifier_param.event.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0';
+ event_notifier_param.event.instrumentation = LTTNG_KERNEL_ABI_SYSCALL;
+
+ event_notifier = _lttng_event_notifier_create(desc, user_token,
+ error_counter_index, group, &event_notifier_param,
+ event_notifier_param.event.instrumentation);
+ if (IS_ERR(event_notifier)) {
+ printk(KERN_INFO "Unable to create event_notifier %s\n",
+ desc->event_name);
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ event_notifier->priv->parent.u.syscall.syscall_id = i;
+ }
+
+end:
+ return ret;
+
+}
+
+int lttng_syscalls_create_matching_event_notifiers(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ int ret;
+ struct lttng_event_enabler_common *base_enabler =
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
+ enum lttng_kernel_abi_syscall_entryexit entryexit =
+ base_enabler->event_param.u.syscall.entryexit;
+
+ if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) {
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ sc_table.table, sc_table.len, SC_TYPE_ENTRY);
+ if (ret)
+ goto end;
+
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ compat_sc_table.table, compat_sc_table.len,
+ 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_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) {
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ sc_exit_table.table, sc_exit_table.len,
+ 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,
+ compat_sc_exit_table.table, compat_sc_exit_table.len,
+ SC_TYPE_COMPAT_EXIT);
+ if (ret)
+ goto end;
+
+ ret = create_unknown_event_notifier(event_notifier_enabler,
+ SC_TYPE_COMPAT_EXIT);
+ if (ret)
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+int lttng_syscalls_unregister_syscall_table(struct lttng_kernel_syscall_table *syscall_table)
{
int ret;
- if (!chan->sc_table)
+ if (!syscall_table->syscall_dispatch)
return 0;
- if (chan->sys_enter_registered) {
+ if (syscall_table->sys_enter_registered) {
ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter",
- (void *) syscall_entry_probe, chan);
+ (void *) syscall_entry_event_probe, syscall_table);
if (ret)
return ret;
- chan->sys_enter_registered = 0;
+ syscall_table->sys_enter_registered = 0;
}
- if (chan->sys_exit_registered) {
+ if (syscall_table->sys_exit_registered) {
ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit",
- (void *) syscall_exit_probe, chan);
+ (void *) syscall_exit_event_probe, syscall_table);
if (ret)
return ret;
- chan->sys_exit_registered = 0;
+ syscall_table->sys_exit_registered = 0;
}
- /* lttng_event destroy will be performed by lttng_session_destroy() */
- kfree(chan->sc_table);
- kfree(chan->sc_exit_table);
+ return 0;
+}
+
+int lttng_syscalls_destroy_syscall_table(struct lttng_kernel_syscall_table *syscall_table)
+{
+ kfree(syscall_table->syscall_dispatch);
+ kfree(syscall_table->syscall_exit_dispatch);
#ifdef CONFIG_COMPAT
- kfree(chan->compat_sc_table);
- kfree(chan->compat_sc_exit_table);
+ kfree(syscall_table->compat_syscall_dispatch);
+ kfree(syscall_table->compat_syscall_exit_dispatch);
#endif
- kfree(chan->sc_filter);
+ kfree(syscall_table->sc_filter);
return 0;
}
int syscall_nr = -1;
int i;
- for (i = 0; i < ARRAY_SIZE(sc_table); i++) {
+ for (i = 0; i < sc_table.len; i++) {
const struct trace_syscall_entry *entry;
const char *it_name;
- entry = &sc_table[i];
+ entry = &sc_table.table[i];
if (!entry->desc)
continue;
- it_name = entry->desc->name;
+ it_name = entry->desc->event_name;
it_name += strlen(SYSCALL_ENTRY_STR);
if (!strcmp(syscall_name, it_name)) {
syscall_nr = i;
int syscall_nr = -1;
int i;
- for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) {
+ for (i = 0; i < compat_sc_table.len; i++) {
const struct trace_syscall_entry *entry;
const char *it_name;
- entry = &compat_sc_table[i];
+ entry = &compat_sc_table.table[i];
if (!entry->desc)
continue;
- it_name = entry->desc->name;
+ it_name = entry->desc->event_name;
it_name += strlen(COMPAT_SYSCALL_ENTRY_STR);
if (!strcmp(syscall_name, it_name)) {
syscall_nr = i;
static
uint32_t get_sc_tables_len(void)
{
- return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table);
+ return sc_table.len + compat_sc_table.len;
}
-int lttng_syscall_filter_enable(struct lttng_channel *chan,
- const char *name)
+static
+const char *get_syscall_name(const char *desc_name,
+ enum lttng_syscall_abi abi,
+ enum lttng_syscall_entryexit entryexit)
{
- int syscall_nr, compat_syscall_nr, ret;
- struct lttng_syscall_filter *filter;
+ size_t prefix_len = 0;
- WARN_ON_ONCE(!chan->sc_table);
- if (!name) {
- /* Enable all system calls by removing filter */
- if (chan->sc_filter) {
- filter = chan->sc_filter;
- rcu_assign_pointer(chan->sc_filter, NULL);
- synchronize_trace();
- kfree(filter);
+ switch (entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ prefix_len = strlen(SYSCALL_ENTRY_STR);
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR);
+ break;
}
- chan->syscall_all = 1;
- return 0;
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ prefix_len = strlen(SYSCALL_EXIT_STR);
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR);
+ break;
+ }
+ break;
}
+ WARN_ON_ONCE(prefix_len == 0);
+ return desc_name + prefix_len;
+}
- if (!chan->sc_filter) {
- if (chan->syscall_all) {
- /*
- * All syscalls are already enabled.
- */
- return -EEXIST;
+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)
+{
+ const char *syscall_name;
+ unsigned long *bitmap;
+ int syscall_nr;
+
+ syscall_name = get_syscall_name(desc_name, abi, entryexit);
+
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ syscall_nr = get_syscall_nr(syscall_name);
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ syscall_nr = get_compat_syscall_nr(syscall_name);
+ break;
+ default:
+ return -EINVAL;
+ }
+ if (syscall_nr < 0)
+ return -ENOENT;
+
+ switch (entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ bitmap = filter->sc_entry;
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ bitmap = filter->sc_compat_entry;
+ break;
+ default:
+ return -EINVAL;
}
- filter = kzalloc(sizeof(struct lttng_syscall_filter),
- GFP_KERNEL);
- if (!filter)
- return -ENOMEM;
- } else {
- filter = chan->sc_filter;
- }
- syscall_nr = get_syscall_nr(name);
- compat_syscall_nr = get_compat_syscall_nr(name);
- if (syscall_nr < 0 && compat_syscall_nr < 0) {
- ret = -ENOENT;
- goto error;
- }
- if (syscall_nr >= 0) {
- if (test_bit(syscall_nr, filter->sc)) {
- ret = -EEXIST;
- goto error;
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ bitmap = filter->sc_exit;
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ bitmap = filter->sc_compat_exit;
+ break;
+ default:
+ return -EINVAL;
}
- bitmap_set(filter->sc, syscall_nr, 1);
+ break;
+ default:
+ return -EINVAL;
}
- if (compat_syscall_nr >= 0) {
- if (test_bit(compat_syscall_nr, filter->sc_compat)) {
- ret = -EEXIST;
- goto error;
+ if (test_bit(syscall_nr, bitmap))
+ return -EEXIST;
+ bitmap_set(bitmap, syscall_nr, 1);
+ return 0;
+}
+
+int lttng_syscall_filter_enable_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
+{
+ struct lttng_event_notifier_group *group = event_notifier->priv->group;
+ struct lttng_kernel_syscall_table *syscall_table = &group->syscall_table;
+ unsigned int syscall_id = event_notifier->priv->parent.u.syscall.syscall_id;
+ struct hlist_head *dispatch_list;
+ int ret = 0;
+
+ WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL);
+
+ ret = lttng_syscall_filter_enable(syscall_table->sc_filter,
+ event_notifier->priv->parent.desc->event_name,
+ event_notifier->priv->parent.u.syscall.abi,
+ event_notifier->priv->parent.u.syscall.entryexit);
+ if (ret) {
+ goto end;
+ }
+
+ switch (event_notifier->priv->parent.u.syscall.entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (event_notifier->priv->parent.u.syscall.abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ dispatch_list = &syscall_table->syscall_dispatch[syscall_id];
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ dispatch_list = &syscall_table->compat_syscall_dispatch[syscall_id];
+ break;
+ default:
+ ret = -EINVAL;
+ goto end;
+ }
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (event_notifier->priv->parent.u.syscall.abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ dispatch_list = &syscall_table->syscall_exit_dispatch[syscall_id];
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ dispatch_list = &syscall_table->compat_syscall_exit_dispatch[syscall_id];
+ break;
+ default:
+ ret = -EINVAL;
+ goto end;
}
- bitmap_set(filter->sc_compat, compat_syscall_nr, 1);
+ break;
+ default:
+ ret = -EINVAL;
+ goto end;
}
- if (!chan->sc_filter)
- rcu_assign_pointer(chan->sc_filter, filter);
- return 0;
-error:
- if (!chan->sc_filter)
- kfree(filter);
- return ret;
+ hlist_add_head_rcu(&event_notifier->priv->parent.u.syscall.node, dispatch_list);
+
+end:
+ return ret ;
}
-int lttng_syscall_filter_disable(struct lttng_channel *chan,
- const char *name)
+int lttng_syscall_filter_enable_event_recorder(struct lttng_kernel_event_recorder *event_recorder)
{
- int syscall_nr, compat_syscall_nr, ret;
- struct lttng_syscall_filter *filter;
+ struct lttng_kernel_channel_buffer *channel = event_recorder->chan;
+ struct lttng_kernel_syscall_table *syscall_table = &channel->priv->parent.syscall_table;
- WARN_ON_ONCE(!chan->sc_table);
+ WARN_ON_ONCE(event_recorder->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL);
- if (!chan->sc_filter) {
- if (!chan->syscall_all)
- return -EEXIST;
- filter = kzalloc(sizeof(struct lttng_syscall_filter),
- GFP_KERNEL);
- if (!filter)
- return -ENOMEM;
- /* Trace all system calls, then apply disable. */
- bitmap_set(filter->sc, 0, NR_syscalls);
- bitmap_set(filter->sc_compat, 0, NR_compat_syscalls);
- } else {
- filter = chan->sc_filter;
- }
+ return lttng_syscall_filter_enable(syscall_table->sc_filter,
+ event_recorder->priv->parent.desc->event_name,
+ event_recorder->priv->parent.u.syscall.abi,
+ event_recorder->priv->parent.u.syscall.entryexit);
+}
- if (!name) {
- /* Fail if all syscalls are already disabled. */
- if (bitmap_empty(filter->sc, NR_syscalls)
- && bitmap_empty(filter->sc_compat,
- NR_compat_syscalls)) {
- ret = -EEXIST;
- goto error;
- }
+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;
- /* Disable all system calls */
- bitmap_clear(filter->sc, 0, NR_syscalls);
- bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls);
- goto apply_filter;
- }
- syscall_nr = get_syscall_nr(name);
- compat_syscall_nr = get_compat_syscall_nr(name);
- if (syscall_nr < 0 && compat_syscall_nr < 0) {
- ret = -ENOENT;
- goto error;
- }
- if (syscall_nr >= 0) {
- if (!test_bit(syscall_nr, filter->sc)) {
- ret = -EEXIST;
- goto error;
- }
- bitmap_clear(filter->sc, syscall_nr, 1);
+ syscall_name = get_syscall_name(desc_name, abi, entryexit);
+
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ syscall_nr = get_syscall_nr(syscall_name);
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ syscall_nr = get_compat_syscall_nr(syscall_name);
+ break;
+ default:
+ return -EINVAL;
}
- if (compat_syscall_nr >= 0) {
- if (!test_bit(compat_syscall_nr, filter->sc_compat)) {
- ret = -EEXIST;
- goto error;
+ if (syscall_nr < 0)
+ return -ENOENT;
+
+ switch (entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ bitmap = filter->sc_entry;
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ bitmap = filter->sc_compat_entry;
+ break;
+ default:
+ return -EINVAL;
}
- bitmap_clear(filter->sc_compat, compat_syscall_nr, 1);
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ bitmap = filter->sc_exit;
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ bitmap = filter->sc_compat_exit;
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
}
-apply_filter:
- if (!chan->sc_filter)
- rcu_assign_pointer(chan->sc_filter, filter);
- chan->syscall_all = 0;
+ if (!test_bit(syscall_nr, bitmap))
+ return -EEXIST;
+ bitmap_clear(bitmap, syscall_nr, 1);
+
return 0;
+}
-error:
- if (!chan->sc_filter)
- kfree(filter);
- return ret;
+int lttng_syscall_filter_disable_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
+{
+ struct lttng_event_notifier_group *group = event_notifier->priv->group;
+ struct lttng_kernel_syscall_table *syscall_table = &group->syscall_table;
+ int ret;
+
+ WARN_ON_ONCE(event_notifier->priv->parent.instrumentation != LTTNG_KERNEL_ABI_SYSCALL);
+
+ ret = lttng_syscall_filter_disable(syscall_table->sc_filter,
+ event_notifier->priv->parent.desc->event_name,
+ event_notifier->priv->parent.u.syscall.abi,
+ event_notifier->priv->parent.u.syscall.entryexit);
+ WARN_ON_ONCE(ret != 0);
+
+ hlist_del_rcu(&event_notifier->priv->parent.u.syscall.node);
+ return 0;
+}
+
+int lttng_syscall_filter_disable_event_recorder(struct lttng_kernel_event_recorder *event_recorder)
+{
+ struct lttng_kernel_channel_buffer *channel = event_recorder->chan;
+ struct lttng_kernel_syscall_table *syscall_table = &channel->priv->parent.syscall_table;
+
+ return lttng_syscall_filter_disable(syscall_table->sc_filter,
+ event_recorder->priv->parent.desc->event_name,
+ event_recorder->priv->parent.u.syscall.abi,
+ event_recorder->priv->parent.u.syscall.entryexit);
}
static
const struct trace_syscall_entry *entry;
int iter = 0;
- for (entry = sc_table;
- entry < sc_table + ARRAY_SIZE(sc_table);
+ for (entry = sc_table.table;
+ entry < sc_table.table + sc_table.len;
entry++) {
if (iter++ >= *pos)
return entry;
}
- for (entry = compat_sc_table;
- entry < compat_sc_table + ARRAY_SIZE(compat_sc_table);
+ for (entry = compat_sc_table.table;
+ entry < compat_sc_table.table + compat_sc_table.len;
entry++) {
if (iter++ >= *pos)
return entry;
const struct trace_syscall_entry **table,
unsigned int *bitness)
{
- if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) {
+ if (entry >= sc_table.table && entry < sc_table.table + sc_table.len) {
if (bitness)
*bitness = BITS_PER_LONG;
if (table)
- *table = sc_table;
+ *table = sc_table.table;
return 0;
}
- if (!(entry >= compat_sc_table
- && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) {
+ if (!(entry >= compat_sc_table.table
+ && entry < compat_sc_table.table + compat_sc_table.len)) {
return -EINVAL;
}
if (bitness)
*bitness = 32;
if (table)
- *table = compat_sc_table;
+ *table = compat_sc_table.table;
return 0;
}
return ret;
if (!entry->desc)
return 0;
- if (table == sc_table) {
+ if (table == sc_table.table) {
index = entry - table;
- name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)];
+ name = &entry->desc->event_name[strlen(SYSCALL_ENTRY_STR)];
} else {
- index = (entry - table) + ARRAY_SIZE(sc_table);
- name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)];
+ index = (entry - table) + sc_table.len;
+ name = &entry->desc->event_name[strlen(COMPAT_SYSCALL_ENTRY_STR)];
}
seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n",
index, name, bitness);
.release = seq_release,
};
-long lttng_channel_syscall_mask(struct lttng_channel *channel,
- struct lttng_kernel_syscall_mask __user *usyscall_mask)
+/*
+ * A syscall is enabled if it is traced for either entry or exit.
+ */
+long lttng_channel_syscall_mask(struct lttng_kernel_channel_buffer *channel,
+ struct lttng_kernel_abi_syscall_mask __user *usyscall_mask)
{
+ struct lttng_kernel_syscall_table *syscall_table = &channel->priv->parent.syscall_table;
uint32_t len, sc_tables_len, bitmask_len;
int ret = 0, bit;
char *tmp_mask;
tmp_mask = kzalloc(bitmask_len, GFP_KERNEL);
if (!tmp_mask)
return -ENOMEM;
- filter = channel->sc_filter;
+ filter = syscall_table->sc_filter;
- for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) {
+ for (bit = 0; bit < sc_table.len; bit++) {
char state;
- if (channel->sc_table) {
- if (filter)
- state = test_bit(bit, filter->sc);
+ if (syscall_table->syscall_dispatch) {
+ if (!(READ_ONCE(syscall_table->syscall_all_entry)
+ || READ_ONCE(syscall_table->syscall_all_exit)) && filter)
+ state = test_bit(bit, filter->sc_entry)
+ || test_bit(bit, filter->sc_exit);
else
state = 1;
} else {
for (; bit < sc_tables_len; bit++) {
char state;
- if (channel->compat_sc_table) {
- if (filter)
- state = test_bit(bit - ARRAY_SIZE(sc_table),
- filter->sc_compat);
+ if (syscall_table->compat_syscall_dispatch) {
+ if (!(READ_ONCE(syscall_table->syscall_all_entry)
+ || READ_ONCE(syscall_table->syscall_all_exit)) && filter)
+ state = test_bit(bit - sc_table.len,
+ filter->sc_compat_entry)
+ || test_bit(bit - sc_table.len,
+ filter->sc_compat_exit);
else
state = 1;
} else {