X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;ds=sidebyside;f=lttng-filter.h;fp=lttng-filter.h;h=0000000000000000000000000000000000000000;hb=2df37e95fa4303ecc0db41334452665491533641;hp=fec2db1f6c3b2fad866a536587bed97fd959b0dd;hpb=3b4aafcbbef722c5d04f2fe06a47c47d4d23eda0;p=lttng-modules.git diff --git a/lttng-filter.h b/lttng-filter.h deleted file mode 100644 index fec2db1f..00000000 --- a/lttng-filter.h +++ /dev/null @@ -1,248 +0,0 @@ -/* SPDX-License-Identifier: MIT - * - * lttng-filter.h - * - * LTTng modules filter header. - * - * Copyright (C) 2010-2016 Mathieu Desnoyers - */ - -#ifndef _LTTNG_FILTER_H -#define _LTTNG_FILTER_H - -#include - -#include -#include - -/* 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 */