+++ /dev/null
-#ifndef _LTTNG_FILTER_H
-#define _LTTNG_FILTER_H
-
-/*
- * lttng-filter.h
- *
- * LTTng modules filter header.
- *
- * Copyright (C) 2010-2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#include <linux/kernel.h>
-
-#include <lttng-events.h>
-#include <filter-bytecode.h>
-
-/* Filter stack length, in number of entries */
-#define FILTER_STACK_LEN 10 /* includes 2 dummy */
-#define FILTER_STACK_EMPTY 1
-
-#define FILTER_MAX_DATA_LEN 65536
-
-#ifdef DEBUG
-#define dbg_printk(fmt, args...) \
- printk(KERN_DEBUG "[debug bytecode in %s:%s@%u] " fmt, \
- __FILE__, __func__, __LINE__, ## args)
-#else
-#define dbg_printk(fmt, args...) \
-do { \
- /* do nothing but check printf format */ \
- if (0) \
- printk(KERN_DEBUG "[debug bytecode in %s:%s@%u] " fmt, \
- __FILE__, __func__, __LINE__, ## args); \
-} while (0)
-#endif
-
-/* Linked bytecode. Child of struct lttng_bytecode_runtime. */
-struct bytecode_runtime {
- struct lttng_bytecode_runtime p;
- size_t data_len;
- size_t data_alloc_len;
- char *data;
- uint16_t len;
- char code[0];
-};
-
-enum entry_type {
- REG_S64,
- REG_DOUBLE,
- REG_STRING,
- REG_STAR_GLOB_STRING,
- REG_TYPE_UNKNOWN,
- REG_PTR,
-};
-
-enum load_type {
- LOAD_ROOT_CONTEXT,
- LOAD_ROOT_APP_CONTEXT,
- LOAD_ROOT_PAYLOAD,
- LOAD_OBJECT,
-};
-
-enum object_type {
- OBJECT_TYPE_S8,
- OBJECT_TYPE_S16,
- OBJECT_TYPE_S32,
- OBJECT_TYPE_S64,
- OBJECT_TYPE_U8,
- OBJECT_TYPE_U16,
- OBJECT_TYPE_U32,
- OBJECT_TYPE_U64,
-
- OBJECT_TYPE_DOUBLE,
- OBJECT_TYPE_STRING,
- OBJECT_TYPE_STRING_SEQUENCE,
-
- OBJECT_TYPE_SEQUENCE,
- OBJECT_TYPE_ARRAY,
- OBJECT_TYPE_STRUCT,
- OBJECT_TYPE_VARIANT,
-
- OBJECT_TYPE_DYNAMIC,
-};
-
-struct filter_get_index_data {
- uint64_t offset; /* in bytes */
- size_t ctx_index;
- size_t array_len;
- struct {
- size_t len;
- enum object_type type;
- bool rev_bo; /* reverse byte order */
- } elem;
-};
-
-/* Validation stack */
-struct vstack_load {
- enum load_type type;
- enum object_type object_type;
- const struct lttng_event_field *field;
- bool rev_bo; /* reverse byte order */
-};
-
-struct vstack_entry {
- enum entry_type type;
- struct vstack_load load;
-};
-
-struct vstack {
- int top; /* top of stack */
- struct vstack_entry e[FILTER_STACK_LEN];
-};
-
-static inline
-void vstack_init(struct vstack *stack)
-{
- stack->top = -1;
-}
-
-static inline
-struct vstack_entry *vstack_ax(struct vstack *stack)
-{
- if (unlikely(stack->top < 0))
- return NULL;
- return &stack->e[stack->top];
-}
-
-static inline
-struct vstack_entry *vstack_bx(struct vstack *stack)
-{
- if (unlikely(stack->top < 1))
- return NULL;
- return &stack->e[stack->top - 1];
-}
-
-static inline
-int vstack_push(struct vstack *stack)
-{
- if (stack->top >= FILTER_STACK_LEN - 1) {
- printk(KERN_WARNING "Stack full\n");
- return -EINVAL;
- }
- ++stack->top;
- return 0;
-}
-
-static inline
-int vstack_pop(struct vstack *stack)
-{
- if (unlikely(stack->top < 0)) {
- printk(KERN_WARNING "Stack empty\n");
- return -EINVAL;
- }
- stack->top--;
- return 0;
-}
-
-/* Execution stack */
-enum estack_string_literal_type {
- ESTACK_STRING_LITERAL_TYPE_NONE,
- ESTACK_STRING_LITERAL_TYPE_PLAIN,
- ESTACK_STRING_LITERAL_TYPE_STAR_GLOB,
-};
-
-struct load_ptr {
- enum load_type type;
- enum object_type object_type;
- const void *ptr;
- bool rev_bo;
- /* Temporary place-holders for contexts. */
- union {
- int64_t s64;
- uint64_t u64;
- double d;
- } u;
- /*
- * "field" is only needed when nested under a variant, in which
- * case we cannot specialize the nested operations.
- */
- const struct lttng_event_field *field;
-};
-
-struct estack_entry {
- union {
- int64_t v;
-
- struct {
- const char *str;
- const char __user *user_str;
- size_t seq_len;
- enum estack_string_literal_type literal_type;
- int user; /* is string from userspace ? */
- } s;
- struct load_ptr ptr;
- } u;
-};
-
-struct estack {
- int top; /* top of stack */
- struct estack_entry e[FILTER_STACK_LEN];
-};
-
-#define estack_ax_v ax
-#define estack_bx_v bx
-
-#define estack_ax(stack, top) \
- ({ \
- BUG_ON((top) <= FILTER_STACK_EMPTY); \
- &(stack)->e[top]; \
- })
-
-#define estack_bx(stack, top) \
- ({ \
- BUG_ON((top) <= FILTER_STACK_EMPTY + 1); \
- &(stack)->e[(top) - 1]; \
- })
-
-#define estack_push(stack, top, ax, bx) \
- do { \
- BUG_ON((top) >= FILTER_STACK_LEN - 1); \
- (stack)->e[(top) - 1].u.v = (bx); \
- (bx) = (ax); \
- ++(top); \
- } while (0)
-
-#define estack_pop(stack, top, ax, bx) \
- do { \
- BUG_ON((top) <= FILTER_STACK_EMPTY); \
- (ax) = (bx); \
- (bx) = (stack)->e[(top) - 2].u.v; \
- (top)--; \
- } while (0)
-
-const char *lttng_filter_print_op(enum filter_op op);
-
-int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode);
-int lttng_filter_specialize_bytecode(struct lttng_event *event,
- struct bytecode_runtime *bytecode);
-
-uint64_t lttng_filter_false(void *filter_data,
- struct lttng_probe_ctx *lttng_probe_ctx,
- const char *filter_stack_data);
-uint64_t lttng_filter_interpret_bytecode(void *filter_data,
- struct lttng_probe_ctx *lttng_probe_ctx,
- const char *filter_stack_data);
-
-#endif /* _LTTNG_FILTER_H */
projects / lttng-modules.git / blobdiff