--- /dev/null
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
+ * lttng/tracepoint-event-impl.h
+ *
+ * Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
+ * Copyright (C) 2009-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#include <linux/uaccess.h>
+#include <linux/debugfs.h>
+#include <linux/rculist.h>
+#include <asm/byteorder.h>
+#include <linux/swab.h>
+
+#include <lttng/types.h>
+#include <lttng/probe-user.h>
+#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
+#include <ringbuffer/frontend_types.h>
+#include <ringbuffer/backend.h>
+#include <wrapper/rcu.h>
+#include <wrapper/user_namespace.h>
+#include <lttng-events.h>
+#include <lttng-tracer-core.h>
+#include <lttng-tp-mempool.h>
+
+#define __LTTNG_NULL_STRING "(null)"
+
+#undef PARAMS
+#define PARAMS(args...) args
+
+/*
+ * Macro declarations used for all stages.
+ */
+
+/*
+ * LTTng name mapping macros. LTTng remaps some of the kernel events to
+ * enforce name-spacing.
+ */
+#undef LTTNG_TRACEPOINT_EVENT_MAP
+#define LTTNG_TRACEPOINT_EVENT_MAP(name, map, proto, args, fields) \
+ LTTNG_TRACEPOINT_EVENT_CLASS(map, \
+ PARAMS(proto), \
+ PARAMS(args), \
+ PARAMS(fields)) \
+ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(map, name, map, PARAMS(proto), PARAMS(args))
+
+#undef LTTNG_TRACEPOINT_EVENT_MAP_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_MAP_NOARGS(name, map, fields) \
+ LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(map, \
+ PARAMS(fields)) \
+ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS(map, name, map)
+
+#undef LTTNG_TRACEPOINT_EVENT_CODE_MAP
+#define LTTNG_TRACEPOINT_EVENT_CODE_MAP(name, map, proto, args, _locvar, _code_pre, fields, _code_post) \
+ LTTNG_TRACEPOINT_EVENT_CLASS_CODE(map, \
+ PARAMS(proto), \
+ PARAMS(args), \
+ PARAMS(_locvar), \
+ PARAMS(_code_pre), \
+ PARAMS(fields), \
+ PARAMS(_code_post)) \
+ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(map, name, map, PARAMS(proto), PARAMS(args))
+
+#undef LTTNG_TRACEPOINT_EVENT_CODE
+#define LTTNG_TRACEPOINT_EVENT_CODE(name, proto, args, _locvar, _code_pre, fields, _code_post) \
+ LTTNG_TRACEPOINT_EVENT_CODE_MAP(name, name, \
+ PARAMS(proto), \
+ PARAMS(args), \
+ PARAMS(_locvar), \
+ PARAMS(_code_pre), \
+ PARAMS(fields), \
+ PARAMS(_code_post))
+
+/*
+ * LTTNG_TRACEPOINT_EVENT_CLASS can be used to add a generic function
+ * handlers for events. That is, if all events have the same parameters
+ * and just have distinct trace points. Each tracepoint can be defined
+ * with LTTNG_TRACEPOINT_EVENT_INSTANCE and that will map the
+ * LTTNG_TRACEPOINT_EVENT_CLASS to the tracepoint.
+ *
+ * LTTNG_TRACEPOINT_EVENT is a one to one mapping between tracepoint and
+ * template.
+ */
+
+#undef LTTNG_TRACEPOINT_EVENT
+#define LTTNG_TRACEPOINT_EVENT(name, proto, args, fields) \
+ LTTNG_TRACEPOINT_EVENT_MAP(name, name, \
+ PARAMS(proto), \
+ PARAMS(args), \
+ PARAMS(fields))
+
+#undef LTTNG_TRACEPOINT_EVENT_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_NOARGS(name, fields) \
+ LTTNG_TRACEPOINT_EVENT_MAP_NOARGS(name, name, PARAMS(fields))
+
+#undef LTTNG_TRACEPOINT_EVENT_INSTANCE
+#define LTTNG_TRACEPOINT_EVENT_INSTANCE(template, name, proto, args) \
+ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(template, name, name, PARAMS(proto), PARAMS(args))
+
+#undef LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(template, name) \
+ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS(template, name, name)
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS
+#define LTTNG_TRACEPOINT_EVENT_CLASS(_name, _proto, _args, _fields) \
+ LTTNG_TRACEPOINT_EVENT_CLASS_CODE(_name, PARAMS(_proto), PARAMS(_args), , , \
+ PARAMS(_fields), )
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
+ LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS(_name, , , PARAMS(_fields), )
+
+
+/*
+ * Stage 1 of the trace events.
+ *
+ * Create dummy trace calls for each events, verifying that the LTTng module
+ * instrumentation headers match the kernel arguments. Will be optimized
+ * out by the compiler.
+ */
+
+/* Reset all macros within TRACEPOINT_EVENT */
+#include <lttng/events-reset.h>
+
+#undef TP_PROTO
+#define TP_PROTO(...) __VA_ARGS__
+
+#undef TP_ARGS
+#define TP_ARGS(...) __VA_ARGS__
+
+#undef LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP
+#define LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(_template, _name, _map, _proto, _args) \
+void trace_##_name(_proto);
+
+#undef LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS(_template, _name, _map) \
+void trace_##_name(void);
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 1.1 of the trace events.
+ *
+ * Create dummy trace prototypes for each event class, and for each used
+ * template. This will allow checking whether the prototypes from the
+ * class and the instance using the class actually match.
+ */
+
+#include <lttng/events-reset.h> /* Reset all macros within TRACE_EVENT */
+
+#undef TP_PROTO
+#define TP_PROTO(...) __VA_ARGS__
+
+#undef TP_ARGS
+#define TP_ARGS(...) __VA_ARGS__
+
+#undef LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP
+#define LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(_template, _name, _map, _proto, _args) \
+void __event_template_proto___##_template(_proto);
+
+#undef LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS(_template, _name, _map) \
+void __event_template_proto___##_template(void);
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
+void __event_template_proto___##_name(_proto);
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS(_name, _locvar, _code_pre, _fields, _code_post) \
+void __event_template_proto___##_name(void);
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 1.2 of tracepoint event generation
+ *
+ * Unfolding the enums
+ */
+#include <lttng/events-reset.h> /* Reset all macros within TRACE_EVENT */
+
+/* Enumeration entry (single value) */
+#undef ctf_enum_value
+#define ctf_enum_value(_string, _value) \
+ { \
+ .start = { \
+ .signedness = lttng_is_signed_type(__typeof__(_value)), \
+ .value = lttng_is_signed_type(__typeof__(_value)) ? \
+ (long long) (_value) : (_value), \
+ }, \
+ .end = { \
+ .signedness = lttng_is_signed_type(__typeof__(_value)), \
+ .value = lttng_is_signed_type(__typeof__(_value)) ? \
+ (long long) (_value) : (_value), \
+ }, \
+ .string = (_string), \
+ },
+
+/* Enumeration entry (range) */
+#undef ctf_enum_range
+#define ctf_enum_range(_string, _range_start, _range_end) \
+ { \
+ .start = { \
+ .signedness = lttng_is_signed_type(__typeof__(_range_start)), \
+ .value = lttng_is_signed_type(__typeof__(_range_start)) ? \
+ (long long) (_range_start) : (_range_start), \
+ }, \
+ .end = { \
+ .signedness = lttng_is_signed_type(__typeof__(_range_end)), \
+ .value = lttng_is_signed_type(__typeof__(_range_end)) ? \
+ (long long) (_range_end) : (_range_end), \
+ }, \
+ .string = (_string), \
+ },
+
+/* Enumeration entry (automatic value; follows the rules of CTF) */
+#undef ctf_enum_auto
+#define ctf_enum_auto(_string) \
+ { \
+ .start = { \
+ .signedness = -1, \
+ .value = -1, \
+ }, \
+ .end = { \
+ .signedness = -1, \
+ .value = -1, \
+ }, \
+ .string = (_string), \
+ .options = { \
+ .is_auto = 1, \
+ } \
+ },
+
+#undef TP_ENUM_VALUES
+#define TP_ENUM_VALUES(...) \
+ __VA_ARGS__
+
+#undef LTTNG_TRACEPOINT_ENUM
+#define LTTNG_TRACEPOINT_ENUM(_name, _values) \
+ const struct lttng_enum_entry __enum_values__##_name[] = { \
+ _values \
+ };
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 2 of the trace events.
+ *
+ * Create event field type metadata section.
+ * Each event produce an array of fields.
+ */
+
+/* Reset all macros within TRACEPOINT_EVENT */
+#include <lttng/events-reset.h>
+#include <lttng/events-write.h>
+#include <lttng/events-nowrite.h>
+
+#undef _ctf_integer_ext
+#define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _user, _nowrite) \
+ { \
+ .name = #_item, \
+ .type = __type_integer(_type, 0, 0, -1, _byte_order, _base, none), \
+ .nowrite = _nowrite, \
+ .user = _user, \
+ .nofilter = 0, \
+ },
+
+#undef _ctf_array_encoded
+#define _ctf_array_encoded(_type, _item, _src, _length, \
+ _encoding, _byte_order, _elem_type_base, _user, _nowrite) \
+ { \
+ .name = #_item, \
+ .type = \
+ { \
+ .atype = atype_array_nestable, \
+ .u = \
+ { \
+ .array_nestable = \
+ { \
+ .elem_type = __LTTNG_COMPOUND_LITERAL(struct lttng_type, \
+ __type_integer(_type, 0, 0, -1, _byte_order, _elem_type_base, _encoding)), \
+ .length = _length, \
+ .alignment = 0, \
+ } \
+ } \
+ }, \
+ .nowrite = _nowrite, \
+ .user = _user, \
+ .nofilter = 0, \
+ },
+
+#undef _ctf_array_bitfield
+#define _ctf_array_bitfield(_type, _item, _src, _length, _user, _nowrite) \
+ { \
+ .name = #_item, \
+ .type = \
+ { \
+ .atype = atype_array_nestable, \
+ .u = \
+ { \
+ .array_nestable = \
+ { \
+ .elem_type = __LTTNG_COMPOUND_LITERAL(struct lttng_type, \
+ __type_integer(_type, 1, 1, 0, __LITTLE_ENDIAN, 10, none)), \
+ .length = (_length) * sizeof(_type) * CHAR_BIT, \
+ .alignment = lttng_alignof(_type), \
+ } \
+ } \
+ }, \
+ .nowrite = _nowrite, \
+ .user = _user, \
+ .nofilter = 0, \
+ },
+
+
+#undef _ctf_sequence_encoded
+#define _ctf_sequence_encoded(_type, _item, _src, \
+ _length_type, _src_length, _encoding, \
+ _byte_order, _elem_type_base, _user, _nowrite) \
+ { \
+ .name = "_" #_item "_length", \
+ .type = __type_integer(_length_type, 0, 0, -1, __BYTE_ORDER, 10, none), \
+ .nowrite = _nowrite, \
+ .nofilter = 1, \
+ }, \
+ { \
+ .name = #_item, \
+ .type = \
+ { \
+ .atype = atype_sequence_nestable, \
+ .u = \
+ { \
+ .sequence_nestable = \
+ { \
+ .length_name = "_" #_item "_length", \
+ .elem_type = __LTTNG_COMPOUND_LITERAL(struct lttng_type, \
+ __type_integer(_type, 0, 0, -1, _byte_order, _elem_type_base, _encoding)), \
+ .alignment = 0, \
+ }, \
+ }, \
+ }, \
+ .nowrite = _nowrite, \
+ .user = _user, \
+ .nofilter = 0, \
+ },
+
+#undef _ctf_sequence_bitfield
+#define _ctf_sequence_bitfield(_type, _item, _src, \
+ _length_type, _src_length, \
+ _user, _nowrite) \
+ { \
+ .name = "_" #_item "_length", \
+ .type = __type_integer(_length_type, 0, 0, -1, __BYTE_ORDER, 10, none), \
+ .nowrite = _nowrite, \
+ .nofilter = 1, \
+ }, \
+ { \
+ .name = #_item, \
+ .type = \
+ { \
+ .atype = atype_sequence_nestable, \
+ .u = \
+ { \
+ .sequence_nestable = \
+ { \
+ .length_name = "_" #_item "_length", \
+ .elem_type = __LTTNG_COMPOUND_LITERAL(struct lttng_type, \
+ __type_integer(_type, 1, 1, 0, __LITTLE_ENDIAN, 10, none)), \
+ .alignment = lttng_alignof(_type), \
+ }, \
+ }, \
+ }, \
+ .nowrite = _nowrite, \
+ .user = _user, \
+ .nofilter = 0, \
+ },
+
+#undef _ctf_string
+#define _ctf_string(_item, _src, _user, _nowrite) \
+ { \
+ .name = #_item, \
+ .type = \
+ { \
+ .atype = atype_string, \
+ .u = \
+ { \
+ .string = { .encoding = lttng_encode_UTF8 }, \
+ }, \
+ }, \
+ .nowrite = _nowrite, \
+ .user = _user, \
+ .nofilter = 0, \
+ },
+
+#undef _ctf_enum
+#define _ctf_enum(_name, _type, _item, _src, _user, _nowrite) \
+ { \
+ .name = #_item, \
+ .type = { \
+ .atype = atype_enum_nestable, \
+ .u = { \
+ .enum_nestable = { \
+ .desc = &__enum_##_name, \
+ .container_type = __LTTNG_COMPOUND_LITERAL(struct lttng_type, \
+ __type_integer(_type, 0, 0, -1, __BYTE_ORDER, 10, none)), \
+ }, \
+ }, \
+ }, \
+ .nowrite = _nowrite, \
+ .user = _user, \
+ .nofilter = 0, \
+ },
+
+#undef ctf_custom_field
+#define ctf_custom_field(_type, _item, _code) \
+ { \
+ .name = #_item, \
+ .type = _type, \
+ .nowrite = 0, \
+ .user = 0, \
+ .nofilter = 1, \
+ },
+
+#undef ctf_custom_type
+#define ctf_custom_type(...) __VA_ARGS__
+
+#undef TP_FIELDS
+#define TP_FIELDS(...) __VA_ARGS__ /* Only one used in this phase */
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS(_name, _locvar, _code_pre, _fields, _code_post) \
+ static const struct lttng_event_field __event_fields___##_name[] = { \
+ _fields \
+ };
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
+ LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS(_name, _locvar, _code_pre, PARAMS(_fields), _code_post)
+
+#undef LTTNG_TRACEPOINT_ENUM
+#define LTTNG_TRACEPOINT_ENUM(_name, _values) \
+ static const struct lttng_enum_desc __enum_##_name = { \
+ .name = #_name, \
+ .entries = __enum_values__##_name, \
+ .nr_entries = ARRAY_SIZE(__enum_values__##_name), \
+ };
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 3 of the trace events.
+ *
+ * Create probe callback prototypes.
+ */
+
+/* Reset all macros within TRACEPOINT_EVENT */
+#include <lttng/events-reset.h>
+
+#undef TP_PROTO
+#define TP_PROTO(...) __VA_ARGS__
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
+static void __event_probe__##_name(void *__data, _proto);
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS(_name, _locvar, _code_pre, _fields, _code_post) \
+static void __event_probe__##_name(void *__data);
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 4 of the trace events.
+ *
+ * Create static inline function that calculates event size.
+ */
+
+/* Reset all macros within TRACEPOINT_EVENT */
+#include <lttng/events-reset.h>
+#include <lttng/events-write.h>
+
+#undef _ctf_integer_ext
+#define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _user, _nowrite) \
+ __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
+ __event_len += sizeof(_type);
+
+#undef _ctf_array_encoded
+#define _ctf_array_encoded(_type, _item, _src, _length, _encoding, _byte_order, _base, _user, _nowrite) \
+ __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
+ __event_len += sizeof(_type) * (_length);
+
+#undef _ctf_array_bitfield
+#define _ctf_array_bitfield(_type, _item, _src, _length, _user, _nowrite) \
+ _ctf_array_encoded(_type, _item, _src, _length, none, __LITTLE_ENDIAN, 0, _user, _nowrite)
+
+#undef _ctf_sequence_encoded
+#define _ctf_sequence_encoded(_type, _item, _src, _length_type, \
+ _src_length, _encoding, _byte_order, _base, _user, _nowrite) \
+ __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_length_type)); \
+ __event_len += sizeof(_length_type); \
+ __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
+ { \
+ size_t __seqlen = (_src_length); \
+ \
+ if (unlikely(++this_cpu_ptr(<tng_dynamic_len_stack)->offset >= LTTNG_DYNAMIC_LEN_STACK_SIZE)) \
+ goto error; \
+ barrier(); /* reserve before use. */ \
+ this_cpu_ptr(<tng_dynamic_len_stack)->stack[this_cpu_ptr(<tng_dynamic_len_stack)->offset - 1] = __seqlen; \
+ __event_len += sizeof(_type) * __seqlen; \
+ }
+
+#undef _ctf_sequence_bitfield
+#define _ctf_sequence_bitfield(_type, _item, _src, \
+ _length_type, _src_length, \
+ _user, _nowrite) \
+ _ctf_sequence_encoded(_type, _item, _src, _length_type, _src_length, \
+ none, __LITTLE_ENDIAN, 10, _user, _nowrite)
+
+/*
+ * ctf_user_string includes \0. If returns 0, it faulted, so we set size to
+ * 1 (\0 only).
+ */
+#undef _ctf_string
+#define _ctf_string(_item, _src, _user, _nowrite) \
+ if (unlikely(++this_cpu_ptr(<tng_dynamic_len_stack)->offset >= LTTNG_DYNAMIC_LEN_STACK_SIZE)) \
+ goto error; \
+ barrier(); /* reserve before use. */ \
+ if (_user) { \
+ __event_len += this_cpu_ptr(<tng_dynamic_len_stack)->stack[this_cpu_ptr(<tng_dynamic_len_stack)->offset - 1] = \
+ max_t(size_t, lttng_strlen_user_inatomic(_src), 1); \
+ } else { \
+ __event_len += this_cpu_ptr(<tng_dynamic_len_stack)->stack[this_cpu_ptr(<tng_dynamic_len_stack)->offset - 1] = \
+ strlen((_src) ? (_src) : __LTTNG_NULL_STRING) + 1; \
+ }
+
+#undef _ctf_enum
+#define _ctf_enum(_name, _type, _item, _src, _user, _nowrite) \
+ _ctf_integer_ext(_type, _item, _src, __BYTE_ORDER, 10, _user, _nowrite)
+
+#undef ctf_align
+#define ctf_align(_type) \
+ __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type));
+
+#undef ctf_custom_field
+#define ctf_custom_field(_type, _item, _code) \
+ { \
+ _code \
+ }
+
+#undef ctf_custom_code
+#define ctf_custom_code(...) __VA_ARGS__
+
+#undef TP_PROTO
+#define TP_PROTO(...) __VA_ARGS__
+
+#undef TP_FIELDS
+#define TP_FIELDS(...) __VA_ARGS__
+
+#undef TP_locvar
+#define TP_locvar(...) __VA_ARGS__
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
+static inline ssize_t __event_get_size__##_name(void *__tp_locvar, _proto) \
+{ \
+ size_t __event_len = 0; \
+ unsigned int __dynamic_len_idx __attribute__((unused)) = 0; \
+ struct { _locvar } *tp_locvar __attribute__((unused)) = __tp_locvar; \
+ \
+ _fields \
+ return __event_len; \
+ \
+error: \
+ __attribute__((unused)); \
+ return -1; \
+}
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS(_name, _locvar, _code_pre, _fields, _code_post) \
+static inline ssize_t __event_get_size__##_name(void *__tp_locvar) \
+{ \
+ size_t __event_len = 0; \
+ unsigned int __dynamic_len_idx __attribute__((unused)) = 0; \
+ struct { _locvar } *tp_locvar __attribute__((unused)) = __tp_locvar; \
+ \
+ _fields \
+ return __event_len; \
+ \
+error: \
+ __attribute__((unused)); \
+ return -1; \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+
+/*
+ * Stage 4.1 of tracepoint event generation.
+ *
+ * Create static inline function that layout the filter stack data.
+ * We make both write and nowrite data available to the filter.
+ */
+
+/* Reset all macros within TRACEPOINT_EVENT */
+#include <lttng/events-reset.h>
+#include <lttng/events-write.h>
+#include <lttng/events-nowrite.h>
+
+#undef _ctf_integer_ext_fetched
+#define _ctf_integer_ext_fetched(_type, _item, _src, _byte_order, _base, _nowrite) \
+ if (lttng_is_signed_type(_type)) { \
+ int64_t __ctf_tmp_int64; \
+ switch (sizeof(_type)) { \
+ case 1: \
+ { \
+ union { _type t; int8_t v; } __tmp = { (_type) (_src) }; \
+ __ctf_tmp_int64 = (int64_t) __tmp.v; \
+ break; \
+ } \
+ case 2: \
+ { \
+ union { _type t; int16_t v; } __tmp = { (_type) (_src) }; \
+ if (_byte_order != __BYTE_ORDER) \
+ __swab16s(&__tmp.v); \
+ __ctf_tmp_int64 = (int64_t) __tmp.v; \
+ break; \
+ } \
+ case 4: \
+ { \
+ union { _type t; int32_t v; } __tmp = { (_type) (_src) }; \
+ if (_byte_order != __BYTE_ORDER) \
+ __swab32s(&__tmp.v); \
+ __ctf_tmp_int64 = (int64_t) __tmp.v; \
+ break; \
+ } \
+ case 8: \
+ { \
+ union { _type t; int64_t v; } __tmp = { (_type) (_src) }; \
+ if (_byte_order != __BYTE_ORDER) \
+ __swab64s(&__tmp.v); \
+ __ctf_tmp_int64 = (int64_t) __tmp.v; \
+ break; \
+ } \
+ default: \
+ BUG_ON(1); \
+ }; \
+ memcpy(__stack_data, &__ctf_tmp_int64, sizeof(int64_t)); \
+ } else { \
+ uint64_t __ctf_tmp_uint64; \
+ switch (sizeof(_type)) { \
+ case 1: \
+ { \
+ union { _type t; uint8_t v; } __tmp = { (_type) (_src) }; \
+ __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
+ break; \
+ } \
+ case 2: \
+ { \
+ union { _type t; uint16_t v; } __tmp = { (_type) (_src) }; \
+ if (_byte_order != __BYTE_ORDER) \
+ __swab16s(&__tmp.v); \
+ __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
+ break; \
+ } \
+ case 4: \
+ { \
+ union { _type t; uint32_t v; } __tmp = { (_type) (_src) }; \
+ if (_byte_order != __BYTE_ORDER) \
+ __swab32s(&__tmp.v); \
+ __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
+ break; \
+ } \
+ case 8: \
+ { \
+ union { _type t; uint64_t v; } __tmp = { (_type) (_src) }; \
+ if (_byte_order != __BYTE_ORDER) \
+ __swab64s(&__tmp.v); \
+ __ctf_tmp_uint64 = (uint64_t) __tmp.v; \
+ break; \
+ } \
+ default: \
+ BUG_ON(1); \
+ }; \
+ memcpy(__stack_data, &__ctf_tmp_uint64, sizeof(uint64_t)); \
+ } \
+ __stack_data += sizeof(int64_t);
+
+#undef _ctf_integer_ext_isuser0
+#define _ctf_integer_ext_isuser0(_type, _item, _src, _byte_order, _base, _nowrite) \
+ _ctf_integer_ext_fetched(_type, _item, _src, _byte_order, _base, _nowrite)
+
+#undef _ctf_integer_ext_isuser1
+#define _ctf_integer_ext_isuser1(_type, _item, _user_src, _byte_order, _base, _nowrite) \
+{ \
+ union { \
+ char __array[sizeof(_user_src)]; \
+ __typeof__(_user_src) __v; \
+ } __tmp_fetch; \
+ if (lib_ring_buffer_copy_from_user_check_nofault(__tmp_fetch.__array, \
+ &(_user_src), sizeof(_user_src))) \
+ memset(__tmp_fetch.__array, 0, sizeof(__tmp_fetch.__array)); \
+ _ctf_integer_ext_fetched(_type, _item, __tmp_fetch.__v, _byte_order, _base, _nowrite) \
+}
+
+#undef _ctf_integer_ext
+#define _ctf_integer_ext(_type, _item, _user_src, _byte_order, _base, _user, _nowrite) \
+ _ctf_integer_ext_isuser##_user(_type, _item, _user_src, _byte_order, _base, _nowrite)
+
+#undef _ctf_array_encoded
+#define _ctf_array_encoded(_type, _item, _src, _length, _encoding, _byte_order, _base, _user, _nowrite) \
+ { \
+ unsigned long __ctf_tmp_ulong = (unsigned long) (_length); \
+ const void *__ctf_tmp_ptr = (_src); \
+ memcpy(__stack_data, &__ctf_tmp_ulong, sizeof(unsigned long)); \
+ __stack_data += sizeof(unsigned long); \
+ memcpy(__stack_data, &__ctf_tmp_ptr, sizeof(void *)); \
+ __stack_data += sizeof(void *); \
+ }
+
+#undef _ctf_array_bitfield
+#define _ctf_array_bitfield(_type, _item, _src, _length, _user, _nowrite) \
+ _ctf_array_encoded(_type, _item, _src, _length, none, __LITTLE_ENDIAN, 0, _user, _nowrite)
+
+#undef _ctf_sequence_encoded
+#define _ctf_sequence_encoded(_type, _item, _src, _length_type, \
+ _src_length, _encoding, _byte_order, _base, _user, _nowrite) \
+ { \
+ unsigned long __ctf_tmp_ulong = (unsigned long) (_src_length); \
+ const void *__ctf_tmp_ptr = (_src); \
+ memcpy(__stack_data, &__ctf_tmp_ulong, sizeof(unsigned long)); \
+ __stack_data += sizeof(unsigned long); \
+ memcpy(__stack_data, &__ctf_tmp_ptr, sizeof(void *)); \
+ __stack_data += sizeof(void *); \
+ }
+
+#undef _ctf_sequence_bitfield
+#define _ctf_sequence_bitfield(_type, _item, _src, \
+ _length_type, _src_length, \
+ _user, _nowrite) \
+ _ctf_sequence_encoded(_type, _item, _src, _length_type, _src_length, \
+ none, __LITTLE_ENDIAN, 10, _user, _nowrite)
+
+#undef _ctf_string
+#define _ctf_string(_item, _src, _user, _nowrite) \
+ { \
+ const void *__ctf_tmp_ptr = \
+ ((_src) ? (_src) : __LTTNG_NULL_STRING); \
+ memcpy(__stack_data, &__ctf_tmp_ptr, sizeof(void *)); \
+ __stack_data += sizeof(void *); \
+ }
+
+#undef _ctf_enum
+#define _ctf_enum(_name, _type, _item, _src, _user, _nowrite) \
+ _ctf_integer_ext(_type, _item, _src, __BYTE_ORDER, 10, _user, _nowrite)
+
+#undef TP_PROTO
+#define TP_PROTO(...) __VA_ARGS__
+
+#undef TP_FIELDS
+#define TP_FIELDS(...) __VA_ARGS__
+
+#undef TP_locvar
+#define TP_locvar(...) __VA_ARGS__
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS(_name, _locvar, _code_pre, _fields, _code_post) \
+static inline \
+void __event_prepare_filter_stack__##_name(char *__stack_data, \
+ void *__tp_locvar) \
+{ \
+ struct { _locvar } *tp_locvar __attribute__((unused)) = __tp_locvar; \
+ \
+ _fields \
+}
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
+static inline \
+void __event_prepare_filter_stack__##_name(char *__stack_data, \
+ void *__tp_locvar, _proto) \
+{ \
+ struct { _locvar } *tp_locvar __attribute__((unused)) = __tp_locvar; \
+ \
+ _fields \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 5 of the trace events.
+ *
+ * Create static inline function that calculates event payload alignment.
+ */
+
+/* Reset all macros within TRACEPOINT_EVENT */
+#include <lttng/events-reset.h>
+#include <lttng/events-write.h>
+
+#undef _ctf_integer_ext
+#define _ctf_integer_ext(_type, _item, _src, _byte_order, _base, _user, _nowrite) \
+ __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
+
+#undef _ctf_array_encoded
+#define _ctf_array_encoded(_type, _item, _src, _length, _encoding, _byte_order, _base, _user, _nowrite) \
+ __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
+
+#undef _ctf_array_bitfield
+#define _ctf_array_bitfield(_type, _item, _src, _length, _user, _nowrite) \
+ _ctf_array_encoded(_type, _item, _src, _length, none, __LITTLE_ENDIAN, 0, _user, _nowrite)
+
+#undef _ctf_sequence_encoded
+#define _ctf_sequence_encoded(_type, _item, _src, _length_type, \
+ _src_length, _encoding, _byte_order, _base, _user, _nowrite) \
+ __event_align = max_t(size_t, __event_align, lttng_alignof(_length_type)); \
+ __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
+
+#undef _ctf_sequence_bitfield
+#define _ctf_sequence_bitfield(_type, _item, _src, \
+ _length_type, _src_length, \
+ _user, _nowrite) \
+ _ctf_sequence_encoded(_type, _item, _src, _length_type, _src_length, \
+ none, __LITTLE_ENDIAN, 10, _user, _nowrite)
+
+#undef _ctf_string
+#define _ctf_string(_item, _src, _user, _nowrite)
+
+#undef _ctf_enum
+#define _ctf_enum(_name, _type, _item, _src, _user, _nowrite) \
+ _ctf_integer_ext(_type, _item, _src, __BYTE_ORDER, 10, _user, _nowrite)
+
+#undef ctf_align
+#define ctf_align(_type) \
+ __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
+
+#undef TP_PROTO
+#define TP_PROTO(...) __VA_ARGS__
+
+#undef TP_FIELDS
+#define TP_FIELDS(...) __VA_ARGS__
+
+#undef TP_locvar
+#define TP_locvar(...) __VA_ARGS__
+
+#undef ctf_custom_field
+#define ctf_custom_field(_type, _item, _code) _code
+
+#undef ctf_custom_code
+#define ctf_custom_code(...) \
+ { \
+ __VA_ARGS__ \
+ }
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
+static inline size_t __event_get_align__##_name(void *__tp_locvar, _proto) \
+{ \
+ size_t __event_align = 1; \
+ struct { _locvar } *tp_locvar __attribute__((unused)) = __tp_locvar; \
+ \
+ _fields \
+ return __event_align; \
+}
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS(_name, _locvar, _code_pre, _fields, _code_post) \
+static inline size_t __event_get_align__##_name(void *__tp_locvar) \
+{ \
+ size_t __event_align = 1; \
+ struct { _locvar } *tp_locvar __attribute__((unused)) = __tp_locvar; \
+ \
+ _fields \
+ return __event_align; \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 6 of tracepoint event generation.
+ *
+ * Create the probe function. This function calls event size calculation
+ * and writes event data into the buffer.
+ */
+
+/* Reset all macros within TRACEPOINT_EVENT */
+#include <lttng/events-reset.h>
+#include <lttng/events-write.h>
+
+#undef _ctf_integer_ext_fetched
+#define _ctf_integer_ext_fetched(_type, _item, _src, _byte_order, _base, _nowrite) \
+ { \
+ _type __tmp = _src; \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp));\
+ __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
+ }
+
+#undef _ctf_integer_ext_isuser0
+#define _ctf_integer_ext_isuser0(_type, _item, _src, _byte_order, _base, _nowrite) \
+ _ctf_integer_ext_fetched(_type, _item, _src, _byte_order, _base, _nowrite)
+
+#undef _ctf_integer_ext_isuser1
+#define _ctf_integer_ext_isuser1(_type, _item, _user_src, _byte_order, _base, _nowrite) \
+{ \
+ union { \
+ char __array[sizeof(_user_src)]; \
+ __typeof__(_user_src) __v; \
+ } __tmp_fetch; \
+ if (lib_ring_buffer_copy_from_user_check_nofault(__tmp_fetch.__array, \
+ &(_user_src), sizeof(_user_src))) \
+ memset(__tmp_fetch.__array, 0, sizeof(__tmp_fetch.__array)); \
+ _ctf_integer_ext_fetched(_type, _item, __tmp_fetch.__v, _byte_order, _base, _nowrite) \
+}
+
+#undef _ctf_integer_ext
+#define _ctf_integer_ext(_type, _item, _user_src, _byte_order, _base, _user, _nowrite) \
+ _ctf_integer_ext_isuser##_user(_type, _item, _user_src, _byte_order, _base, _nowrite)
+
+#undef _ctf_array_encoded
+#define _ctf_array_encoded(_type, _item, _src, _length, _encoding, _byte_order, _base, _user, _nowrite) \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type)); \
+ if (_user) { \
+ __chan->ops->event_write_from_user(&__ctx, _src, sizeof(_type) * (_length)); \
+ } else { \
+ __chan->ops->event_write(&__ctx, _src, sizeof(_type) * (_length)); \
+ }
+
+#if (__BYTE_ORDER == __LITTLE_ENDIAN)
+#undef _ctf_array_bitfield
+#define _ctf_array_bitfield(_type, _item, _src, _length, _user, _nowrite) \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type)); \
+ if (_user) { \
+ __chan->ops->event_write_from_user(&__ctx, _src, sizeof(_type) * (_length)); \
+ } else { \
+ __chan->ops->event_write(&__ctx, _src, sizeof(_type) * (_length)); \
+ }
+#else /* #if (__BYTE_ORDER == __LITTLE_ENDIAN) */
+/*
+ * For big endian, we need to byteswap into little endian.
+ */
+#undef _ctf_array_bitfield
+#define _ctf_array_bitfield(_type, _item, _src, _length, _user, _nowrite) \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type)); \
+ { \
+ size_t _i; \
+ \
+ for (_i = 0; _i < (_length); _i++) { \
+ _type _tmp; \
+ \
+ if (_user) { \
+ if (get_user(_tmp, (_type *) _src + _i)) \
+ _tmp = 0; \
+ } else { \
+ _tmp = ((_type *) _src)[_i]; \
+ } \
+ switch (sizeof(_type)) { \
+ case 1: \
+ break; \
+ case 2: \
+ _tmp = cpu_to_le16(_tmp); \
+ break; \
+ case 4: \
+ _tmp = cpu_to_le32(_tmp); \
+ break; \
+ case 8: \
+ _tmp = cpu_to_le64(_tmp); \
+ break; \
+ default: \
+ BUG_ON(1); \
+ } \
+ __chan->ops->event_write(&__ctx, &_tmp, sizeof(_type)); \
+ } \
+ }
+#endif /* #else #if (__BYTE_ORDER == __LITTLE_ENDIAN) */
+
+#undef _ctf_sequence_encoded
+#define _ctf_sequence_encoded(_type, _item, _src, _length_type, \
+ _src_length, _encoding, _byte_order, _base, _user, _nowrite) \
+ { \
+ _length_type __tmpl = this_cpu_ptr(<tng_dynamic_len_stack)->stack[__dynamic_len_idx]; \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_length_type));\
+ __chan->ops->event_write(&__ctx, &__tmpl, sizeof(_length_type));\
+ } \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type)); \
+ if (_user) { \
+ __chan->ops->event_write_from_user(&__ctx, _src, \
+ sizeof(_type) * __get_dynamic_len(dest)); \
+ } else { \
+ __chan->ops->event_write(&__ctx, _src, \
+ sizeof(_type) * __get_dynamic_len(dest)); \
+ }
+
+#if (__BYTE_ORDER == __LITTLE_ENDIAN)
+#undef _ctf_sequence_bitfield
+#define _ctf_sequence_bitfield(_type, _item, _src, \
+ _length_type, _src_length, \
+ _user, _nowrite) \
+ { \
+ _length_type __tmpl = this_cpu_ptr(<tng_dynamic_len_stack)->stack[__dynamic_len_idx] * sizeof(_type) * CHAR_BIT; \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_length_type));\
+ __chan->ops->event_write(&__ctx, &__tmpl, sizeof(_length_type));\
+ } \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type)); \
+ if (_user) { \
+ __chan->ops->event_write_from_user(&__ctx, _src, \
+ sizeof(_type) * __get_dynamic_len(dest)); \
+ } else { \
+ __chan->ops->event_write(&__ctx, _src, \
+ sizeof(_type) * __get_dynamic_len(dest)); \
+ }
+#else /* #if (__BYTE_ORDER == __LITTLE_ENDIAN) */
+/*
+ * For big endian, we need to byteswap into little endian.
+ */
+#undef _ctf_sequence_bitfield
+#define _ctf_sequence_bitfield(_type, _item, _src, \
+ _length_type, _src_length, \
+ _user, _nowrite) \
+ { \
+ _length_type __tmpl = this_cpu_ptr(<tng_dynamic_len_stack)->stack[__dynamic_len_idx] * sizeof(_type) * CHAR_BIT; \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_length_type));\
+ __chan->ops->event_write(&__ctx, &__tmpl, sizeof(_length_type));\
+ } \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type)); \
+ { \
+ size_t _i, _length; \
+ \
+ _length = __get_dynamic_len(dest); \
+ for (_i = 0; _i < _length; _i++) { \
+ _type _tmp; \
+ \
+ if (_user) { \
+ if (get_user(_tmp, (_type *) _src + _i)) \
+ _tmp = 0; \
+ } else { \
+ _tmp = ((_type *) _src)[_i]; \
+ } \
+ switch (sizeof(_type)) { \
+ case 1: \
+ break; \
+ case 2: \
+ _tmp = cpu_to_le16(_tmp); \
+ break; \
+ case 4: \
+ _tmp = cpu_to_le32(_tmp); \
+ break; \
+ case 8: \
+ _tmp = cpu_to_le64(_tmp); \
+ break; \
+ default: \
+ BUG_ON(1); \
+ } \
+ __chan->ops->event_write(&__ctx, &_tmp, sizeof(_type)); \
+ } \
+ }
+#endif /* #else #if (__BYTE_ORDER == __LITTLE_ENDIAN) */
+
+#undef _ctf_string
+#define _ctf_string(_item, _src, _user, _nowrite) \
+ if (_user) { \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(*(_src))); \
+ __chan->ops->event_strcpy_from_user(&__ctx, _src, \
+ __get_dynamic_len(dest)); \
+ } else { \
+ const char *__ctf_tmp_string = \
+ ((_src) ? (_src) : __LTTNG_NULL_STRING); \
+ lib_ring_buffer_align_ctx(&__ctx, \
+ lttng_alignof(*__ctf_tmp_string)); \
+ __chan->ops->event_strcpy(&__ctx, __ctf_tmp_string, \
+ __get_dynamic_len(dest)); \
+ }
+
+#undef _ctf_enum
+#define _ctf_enum(_name, _type, _item, _src, _user, _nowrite) \
+ _ctf_integer_ext(_type, _item, _src, __BYTE_ORDER, 10, _user, _nowrite)
+
+#undef ctf_align
+#define ctf_align(_type) \
+ lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(_type));
+
+#undef ctf_custom_field
+#define ctf_custom_field(_type, _item, _code) _code
+
+#undef ctf_custom_code
+#define ctf_custom_code(...) \
+ { \
+ __VA_ARGS__ \
+ }
+
+/* Beware: this get len actually consumes the len value */
+#undef __get_dynamic_len
+#define __get_dynamic_len(field) this_cpu_ptr(<tng_dynamic_len_stack)->stack[__dynamic_len_idx++]
+
+#undef TP_PROTO
+#define TP_PROTO(...) __VA_ARGS__
+
+#undef TP_ARGS
+#define TP_ARGS(...) __VA_ARGS__
+
+#undef TP_FIELDS
+#define TP_FIELDS(...) __VA_ARGS__
+
+#undef TP_locvar
+#define TP_locvar(...) __VA_ARGS__
+
+#undef TP_code_pre
+#define TP_code_pre(...) __VA_ARGS__
+
+#undef TP_code_post
+#define TP_code_post(...) __VA_ARGS__
+
+/*
+ * For state dump, check that "session" argument (mandatory) matches the
+ * session this event belongs to. Ensures that we write state dump data only
+ * into the started session, not into all sessions.
+ */
+#ifdef TP_SESSION_CHECK
+#define _TP_SESSION_CHECK(session, csession) (session == csession)
+#else /* TP_SESSION_CHECK */
+#define _TP_SESSION_CHECK(session, csession) 1
+#endif /* TP_SESSION_CHECK */
+
+/*
+ * Using twice size for filter stack data to hold size and pointer for
+ * each field (worse case). For integers, max size required is 64-bit.
+ * Same for double-precision floats. Those fit within
+ * 2*sizeof(unsigned long) for all supported architectures.
+ * Perform UNION (||) of filter runtime list.
+ */
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
+static void __event_probe__##_name(void *__data, _proto) \
+{ \
+ struct probe_local_vars { _locvar }; \
+ struct lttng_event *__event = __data; \
+ struct lttng_probe_ctx __lttng_probe_ctx = { \
+ .event = __event, \
+ .interruptible = !irqs_disabled(), \
+ }; \
+ struct lttng_channel *__chan = __event->chan; \
+ struct lttng_session *__session = __chan->session; \
+ struct lib_ring_buffer_ctx __ctx; \
+ ssize_t __event_len; \
+ size_t __event_align; \
+ size_t __orig_dynamic_len_offset, __dynamic_len_idx __attribute__((unused)); \
+ union { \
+ size_t __dynamic_len_removed[ARRAY_SIZE(__event_fields___##_name)]; \
+ char __filter_stack_data[2 * sizeof(unsigned long) * ARRAY_SIZE(__event_fields___##_name)]; \
+ } __stackvar; \
+ int __ret; \
+ struct probe_local_vars __tp_locvar; \
+ struct probe_local_vars *tp_locvar __attribute__((unused)) = \
+ &__tp_locvar; \
+ struct lttng_id_tracker_rcu *__lf; \
+ \
+ if (!_TP_SESSION_CHECK(session, __session)) \
+ return; \
+ if (unlikely(!READ_ONCE(__session->active))) \
+ return; \
+ if (unlikely(!READ_ONCE(__chan->enabled))) \
+ return; \
+ if (unlikely(!READ_ONCE(__event->enabled))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->pid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, current->tgid))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->vpid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, task_tgid_vnr(current)))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->uid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, \
+ lttng_current_uid()))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->vuid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, \
+ lttng_current_vuid()))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->gid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, \
+ lttng_current_gid()))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->vgid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, \
+ lttng_current_vgid()))) \
+ return; \
+ __orig_dynamic_len_offset = this_cpu_ptr(<tng_dynamic_len_stack)->offset; \
+ __dynamic_len_idx = __orig_dynamic_len_offset; \
+ _code_pre \
+ if (unlikely(!list_empty(&__event->bytecode_runtime_head))) { \
+ struct lttng_bytecode_runtime *bc_runtime; \
+ int __filter_record = __event->has_enablers_without_bytecode; \
+ \
+ __event_prepare_filter_stack__##_name(__stackvar.__filter_stack_data, \
+ tp_locvar, _args); \
+ lttng_list_for_each_entry_rcu(bc_runtime, &__event->bytecode_runtime_head, node) { \
+ if (unlikely(bc_runtime->filter(bc_runtime, &__lttng_probe_ctx, \
+ __stackvar.__filter_stack_data) & LTTNG_FILTER_RECORD_FLAG)) { \
+ __filter_record = 1; \
+ break; \
+ } \
+ } \
+ if (likely(!__filter_record)) \
+ goto __post; \
+ } \
+ __event_len = __event_get_size__##_name(tp_locvar, _args); \
+ if (unlikely(__event_len < 0)) { \
+ lib_ring_buffer_lost_event_too_big(__chan->chan); \
+ goto __post; \
+ } \
+ __event_align = __event_get_align__##_name(tp_locvar, _args); \
+ lib_ring_buffer_ctx_init(&__ctx, __chan->chan, &__lttng_probe_ctx, __event_len, \
+ __event_align, -1); \
+ __ret = __chan->ops->event_reserve(&__ctx, __event->id); \
+ if (__ret < 0) \
+ goto __post; \
+ _fields \
+ __chan->ops->event_commit(&__ctx); \
+__post: \
+ _code_post \
+ barrier(); /* use before un-reserve. */ \
+ this_cpu_ptr(<tng_dynamic_len_stack)->offset = __orig_dynamic_len_offset; \
+ return; \
+}
+
+#undef LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_CLASS_CODE_NOARGS(_name, _locvar, _code_pre, _fields, _code_post) \
+static void __event_probe__##_name(void *__data) \
+{ \
+ struct probe_local_vars { _locvar }; \
+ struct lttng_event *__event = __data; \
+ struct lttng_probe_ctx __lttng_probe_ctx = { \
+ .event = __event, \
+ .interruptible = !irqs_disabled(), \
+ }; \
+ struct lttng_channel *__chan = __event->chan; \
+ struct lttng_session *__session = __chan->session; \
+ struct lib_ring_buffer_ctx __ctx; \
+ ssize_t __event_len; \
+ size_t __event_align; \
+ size_t __orig_dynamic_len_offset, __dynamic_len_idx __attribute__((unused)); \
+ union { \
+ size_t __dynamic_len_removed[ARRAY_SIZE(__event_fields___##_name)]; \
+ char __filter_stack_data[2 * sizeof(unsigned long) * ARRAY_SIZE(__event_fields___##_name)]; \
+ } __stackvar; \
+ int __ret; \
+ struct probe_local_vars __tp_locvar; \
+ struct probe_local_vars *tp_locvar __attribute__((unused)) = \
+ &__tp_locvar; \
+ struct lttng_id_tracker_rcu *__lf; \
+ \
+ if (!_TP_SESSION_CHECK(session, __session)) \
+ return; \
+ if (unlikely(!READ_ONCE(__session->active))) \
+ return; \
+ if (unlikely(!READ_ONCE(__chan->enabled))) \
+ return; \
+ if (unlikely(!READ_ONCE(__event->enabled))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->pid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, current->tgid))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->vpid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, task_tgid_vnr(current)))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->uid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, \
+ lttng_current_uid()))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->vuid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, \
+ lttng_current_vuid()))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->gid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, \
+ lttng_current_gid()))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->vgid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, \
+ lttng_current_vgid()))) \
+ return; \
+ __orig_dynamic_len_offset = this_cpu_ptr(<tng_dynamic_len_stack)->offset; \
+ __dynamic_len_idx = __orig_dynamic_len_offset; \
+ _code_pre \
+ if (unlikely(!list_empty(&__event->bytecode_runtime_head))) { \
+ struct lttng_bytecode_runtime *bc_runtime; \
+ int __filter_record = __event->has_enablers_without_bytecode; \
+ \
+ __event_prepare_filter_stack__##_name(__stackvar.__filter_stack_data, \
+ tp_locvar); \
+ lttng_list_for_each_entry_rcu(bc_runtime, &__event->bytecode_runtime_head, node) { \
+ if (unlikely(bc_runtime->filter(bc_runtime, &__lttng_probe_ctx, \
+ __stackvar.__filter_stack_data) & LTTNG_FILTER_RECORD_FLAG)) { \
+ __filter_record = 1; \
+ break; \
+ } \
+ } \
+ if (likely(!__filter_record)) \
+ goto __post; \
+ } \
+ __event_len = __event_get_size__##_name(tp_locvar); \
+ if (unlikely(__event_len < 0)) { \
+ lib_ring_buffer_lost_event_too_big(__chan->chan); \
+ goto __post; \
+ } \
+ __event_align = __event_get_align__##_name(tp_locvar); \
+ lib_ring_buffer_ctx_init(&__ctx, __chan->chan, &__lttng_probe_ctx, __event_len, \
+ __event_align, -1); \
+ __ret = __chan->ops->event_reserve(&__ctx, __event->id); \
+ if (__ret < 0) \
+ goto __post; \
+ _fields \
+ __chan->ops->event_commit(&__ctx); \
+__post: \
+ _code_post \
+ barrier(); /* use before un-reserve. */ \
+ this_cpu_ptr(<tng_dynamic_len_stack)->offset = __orig_dynamic_len_offset; \
+ return; \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+#undef __get_dynamic_len
+
+/*
+ * Stage 7 of the trace events.
+ *
+ * Create event descriptions.
+ */
+
+/* Named field types must be defined in lttng-types.h */
+
+#include <lttng/events-reset.h> /* Reset all macros within LTTNG_TRACEPOINT_EVENT */
+
+#ifndef TP_PROBE_CB
+#define TP_PROBE_CB(_template) &__event_probe__##_template
+#endif
+
+#undef LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS(_template, _name, _map) \
+static const struct lttng_event_desc __event_desc___##_map = { \
+ .fields = __event_fields___##_template, \
+ .name = #_map, \
+ .kname = #_name, \
+ .probe_callback = (void *) TP_PROBE_CB(_template), \
+ .nr_fields = ARRAY_SIZE(__event_fields___##_template), \
+ .owner = THIS_MODULE, \
+};
+
+#undef LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP
+#define LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(_template, _name, _map, _proto, _args) \
+ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS(_template, _name, _map)
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/*
+ * Stage 8 of the trace events.
+ *
+ * Create an array of event description pointers.
+ */
+
+#include <lttng/events-reset.h> /* Reset all macros within LTTNG_TRACEPOINT_EVENT */
+
+#undef LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS
+#define LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS(_template, _name, _map) \
+ &__event_desc___##_map,
+
+#undef LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP
+#define LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(_template, _name, _map, _proto, _args) \
+ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP_NOARGS(_template, _name, _map)
+
+#define TP_ID1(_token, _system) _token##_system
+#define TP_ID(_token, _system) TP_ID1(_token, _system)
+
+static const struct lttng_event_desc *TP_ID(__event_desc___, TRACE_SYSTEM)[] = {
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+};
+
+#undef TP_ID1
+#undef TP_ID
+
+/*
+ * Stage 9 of the trace events.
+ *
+ * Create a toplevel descriptor for the whole probe.
+ */
+
+#define TP_ID1(_token, _system) _token##_system
+#define TP_ID(_token, _system) TP_ID1(_token, _system)
+
+/* non-const because list head will be modified when registered. */
+static __used struct lttng_probe_desc TP_ID(__probe_desc___, TRACE_SYSTEM) = {
+ .provider = __stringify(TRACE_SYSTEM),
+ .event_desc = TP_ID(__event_desc___, TRACE_SYSTEM),
+ .nr_events = ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)),
+ .head = { NULL, NULL },
+ .lazy_init_head = { NULL, NULL },
+ .lazy = 0,
+};
+
+#undef TP_ID1
+#undef TP_ID
+
+/*
+ * Stage 10 of the trace events.
+ *
+ * Register/unregister probes at module load/unload.
+ */
+
+#include <lttng/events-reset.h> /* Reset all macros within LTTNG_TRACEPOINT_EVENT */
+
+#define TP_ID1(_token, _system) _token##_system
+#define TP_ID(_token, _system) TP_ID1(_token, _system)
+#define module_init_eval1(_token, _system) module_init(_token##_system)
+#define module_init_eval(_token, _system) module_init_eval1(_token, _system)
+#define module_exit_eval1(_token, _system) module_exit(_token##_system)
+#define module_exit_eval(_token, _system) module_exit_eval1(_token, _system)
+
+#ifndef TP_MODULE_NOINIT
+static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void)
+{
+ wrapper_vmalloc_sync_mappings();
+ return lttng_probe_register(&TP_ID(__probe_desc___, TRACE_SYSTEM));
+}
+
+static void TP_ID(__lttng_events_exit__, TRACE_SYSTEM)(void)
+{
+ lttng_probe_unregister(&TP_ID(__probe_desc___, TRACE_SYSTEM));
+}
+
+#ifndef TP_MODULE_NOAUTOLOAD
+module_init_eval(__lttng_events_init__, TRACE_SYSTEM);
+module_exit_eval(__lttng_events_exit__, TRACE_SYSTEM);
+#endif
+
+#endif
+
+#undef module_init_eval
+#undef module_exit_eval
+#undef TP_ID1
+#undef TP_ID
+
+#undef TP_PROTO
+#undef TP_ARGS
projects / deliverable / lttng-modules.git / blobdiff