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lttng-filter-interpreter.c
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lttng-filter-interpreter.c
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/* SPDX-License-Identifier: MIT
*
* lttng-filter-interpreter.c
*
* LTTng modules filter interpreter.
*
* Copyright (C) 2010-2016 Mathieu Desnoyers <[email protected]>
*/
#include <linux/uaccess.h>
#include <wrapper/frame.h>
#include <wrapper/types.h>
#include <linux/swab.h>
#include <lttng-filter.h>
#include <lttng-string-utils.h>
LTTNG_STACK_FRAME_NON_STANDARD(lttng_filter_interpret_bytecode);
/*
* get_char should be called with page fault handler disabled if it is expected
* to handle user-space read.
*/
static
char get_char(struct estack_entry *reg, size_t offset)
{
if (unlikely(offset >= reg->u.s.seq_len))
return '\0';
if (reg->u.s.user) {
char c;
/* Handle invalid access as end of string. */
if (unlikely(!access_ok(VERIFY_READ,
reg->u.s.user_str + offset,
sizeof(c))))
return '\0';
/* Handle fault (nonzero return value) as end of string. */
if (unlikely(__copy_from_user_inatomic(&c,
reg->u.s.user_str + offset,
sizeof(c))))
return '\0';
return c;
} else {
return reg->u.s.str[offset];
}
}
/*
* -1: wildcard found.
* -2: unknown escape char.
* 0: normal char.
*/
static
int parse_char(struct estack_entry *reg, char *c, size_t *offset)
{
switch (*c) {
case '\\':
(*offset)++;
*c = get_char(reg, *offset);
switch (*c) {
case '\\':
case '*':
return 0;
default:
return -2;
}
case '*':
return -1;
default:
return 0;
}
}
static
char get_char_at_cb(size_t at, void *data)
{
return get_char(data, at);
}
static
int stack_star_glob_match(struct estack *stack, int top, const char *cmp_type)
{
bool has_user = false;
mm_segment_t old_fs;
int result;
struct estack_entry *pattern_reg;
struct estack_entry *candidate_reg;
if (estack_bx(stack, top)->u.s.user
|| estack_ax(stack, top)->u.s.user) {
has_user = true;
old_fs = get_fs();
set_fs(KERNEL_DS);
pagefault_disable();
}
/* Find out which side is the pattern vs. the candidate. */
if (estack_ax(stack, top)->u.s.literal_type == ESTACK_STRING_LITERAL_TYPE_STAR_GLOB) {
pattern_reg = estack_ax(stack, top);
candidate_reg = estack_bx(stack, top);
} else {
pattern_reg = estack_bx(stack, top);
candidate_reg = estack_ax(stack, top);
}
/* Perform the match operation. */
result = !strutils_star_glob_match_char_cb(get_char_at_cb,
pattern_reg, get_char_at_cb, candidate_reg);
if (has_user) {
pagefault_enable();
set_fs(old_fs);
}
return result;
}
static
int stack_strcmp(struct estack *stack, int top, const char *cmp_type)
{
size_t offset_bx = 0, offset_ax = 0;
int diff, has_user = 0;
mm_segment_t old_fs;
if (estack_bx(stack, top)->u.s.user
|| estack_ax(stack, top)->u.s.user) {
has_user = 1;
old_fs = get_fs();
set_fs(KERNEL_DS);
pagefault_disable();
}
for (;;) {
int ret;
int escaped_r0 = 0;
char char_bx, char_ax;
char_bx = get_char(estack_bx(stack, top), offset_bx);
char_ax = get_char(estack_ax(stack, top), offset_ax);
if (unlikely(char_bx == '\0')) {
if (char_ax == '\0') {
diff = 0;
break;
} else {
if (estack_ax(stack, top)->u.s.literal_type ==
ESTACK_STRING_LITERAL_TYPE_PLAIN) {
ret = parse_char(estack_ax(stack, top),
&char_ax, &offset_ax);
if (ret == -1) {
diff = 0;
break;
}
}
diff = -1;
break;
}
}
if (unlikely(char_ax == '\0')) {
if (estack_bx(stack, top)->u.s.literal_type ==
ESTACK_STRING_LITERAL_TYPE_PLAIN) {
ret = parse_char(estack_bx(stack, top),
&char_bx, &offset_bx);
if (ret == -1) {
diff = 0;
break;
}
}
diff = 1;
break;
}
if (estack_bx(stack, top)->u.s.literal_type ==
ESTACK_STRING_LITERAL_TYPE_PLAIN) {
ret = parse_char(estack_bx(stack, top),
&char_bx, &offset_bx);
if (ret == -1) {
diff = 0;
break;
} else if (ret == -2) {
escaped_r0 = 1;
}
/* else compare both char */
}
if (estack_ax(stack, top)->u.s.literal_type ==
ESTACK_STRING_LITERAL_TYPE_PLAIN) {
ret = parse_char(estack_ax(stack, top),
&char_ax, &offset_ax);
if (ret == -1) {
diff = 0;
break;
} else if (ret == -2) {
if (!escaped_r0) {
diff = -1;
break;
}
} else {
if (escaped_r0) {
diff = 1;
break;
}
}
} else {
if (escaped_r0) {
diff = 1;
break;
}
}
diff = char_bx - char_ax;
if (diff != 0)
break;
offset_bx++;
offset_ax++;
}
if (has_user) {
pagefault_enable();
set_fs(old_fs);
}
return diff;
}
uint64_t lttng_filter_false(void *filter_data,
struct lttng_probe_ctx *lttng_probe_ctx,
const char *filter_stack_data)
{
return 0;
}
#ifdef INTERPRETER_USE_SWITCH
/*
* Fallback for compilers that do not support taking address of labels.
*/
#define START_OP \
start_pc = &bytecode->data[0]; \
for (pc = next_pc = start_pc; pc - start_pc < bytecode->len; \
pc = next_pc) { \
dbg_printk("Executing op %s (%u)\n", \
lttng_filter_print_op((unsigned int) *(filter_opcode_t *) pc), \
(unsigned int) *(filter_opcode_t *) pc); \
switch (*(filter_opcode_t *) pc) {
#define OP(name) case name
#define PO break
#define END_OP } \
}
#else
/*
* Dispatch-table based interpreter.
*/
#define START_OP \
start_pc = &bytecode->code[0]; \
pc = next_pc = start_pc; \
if (unlikely(pc - start_pc >= bytecode->len)) \
goto end; \
goto *dispatch[*(filter_opcode_t *) pc];
#define OP(name) \
LABEL_##name
#define PO \
pc = next_pc; \
goto *dispatch[*(filter_opcode_t *) pc];
#define END_OP
#endif
static int context_get_index(struct lttng_probe_ctx *lttng_probe_ctx,
struct load_ptr *ptr,
uint32_t idx)
{
struct lttng_ctx_field *ctx_field;
struct lttng_event_field *field;
union lttng_ctx_value v;
ctx_field = <tng_static_ctx->fields[idx];
field = &ctx_field->event_field;
ptr->type = LOAD_OBJECT;
/* field is only used for types nested within variants. */
ptr->field = NULL;
switch (field->type.atype) {
case atype_integer:
ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
if (field->type.u.basic.integer.signedness) {
ptr->object_type = OBJECT_TYPE_S64;
ptr->u.s64 = v.s64;
ptr->ptr = &ptr->u.s64;
} else {
ptr->object_type = OBJECT_TYPE_U64;
ptr->u.u64 = v.s64; /* Cast. */
ptr->ptr = &ptr->u.u64;
}
break;
case atype_enum:
{
const struct lttng_integer_type *itype =
&field->type.u.basic.enumeration.container_type;
ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
if (itype->signedness) {
ptr->object_type = OBJECT_TYPE_S64;
ptr->u.s64 = v.s64;
ptr->ptr = &ptr->u.s64;
} else {
ptr->object_type = OBJECT_TYPE_U64;
ptr->u.u64 = v.s64; /* Cast. */
ptr->ptr = &ptr->u.u64;
}
break;
}
case atype_array:
if (field->type.u.array.elem_type.atype != atype_integer) {
printk(KERN_WARNING "Array nesting only supports integer types.\n");
return -EINVAL;
}
if (field->type.u.array.elem_type.u.basic.integer.encoding == lttng_encode_none) {
printk(KERN_WARNING "Only string arrays are supported for contexts.\n");
return -EINVAL;
}
ptr->object_type = OBJECT_TYPE_STRING;
ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
ptr->ptr = v.str;
break;
case atype_sequence:
if (field->type.u.sequence.elem_type.atype != atype_integer) {
printk(KERN_WARNING "Sequence nesting only supports integer types.\n");
return -EINVAL;
}
if (field->type.u.sequence.elem_type.u.basic.integer.encoding == lttng_encode_none) {
printk(KERN_WARNING "Only string sequences are supported for contexts.\n");
return -EINVAL;
}
ptr->object_type = OBJECT_TYPE_STRING;
ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
ptr->ptr = v.str;
break;
case atype_array_bitfield:
printk(KERN_WARNING "Bitfield array type is not supported.\n");
return -EINVAL;
case atype_sequence_bitfield:
printk(KERN_WARNING "Bitfield sequence type is not supported.\n");
return -EINVAL;
case atype_string:
ptr->object_type = OBJECT_TYPE_STRING;
ctx_field->get_value(ctx_field, lttng_probe_ctx, &v);
ptr->ptr = v.str;
break;
case atype_struct:
printk(KERN_WARNING "Structure type cannot be loaded.\n");
return -EINVAL;
default:
printk(KERN_WARNING "Unknown type: %d", (int) field->type.atype);
return -EINVAL;
}
return 0;
}
static int dynamic_get_index(struct lttng_probe_ctx *lttng_probe_ctx,
struct bytecode_runtime *runtime,
uint64_t index, struct estack_entry *stack_top)
{
int ret;
const struct filter_get_index_data *gid;
/*
* Types nested within variants need to perform dynamic lookup
* based on the field descriptions. LTTng-UST does not implement
* variants for now.
*/
if (stack_top->u.ptr.field)
return -EINVAL;
gid = (const struct filter_get_index_data *) &runtime->data[index];
switch (stack_top->u.ptr.type) {
case LOAD_OBJECT:
switch (stack_top->u.ptr.object_type) {
case OBJECT_TYPE_ARRAY:
{
const char *ptr;
WARN_ON_ONCE(gid->offset >= gid->array_len);
/* Skip count (unsigned long) */
ptr = *(const char **) (stack_top->u.ptr.ptr + sizeof(unsigned long));
ptr = ptr + gid->offset;
stack_top->u.ptr.ptr = ptr;
stack_top->u.ptr.object_type = gid->elem.type;
stack_top->u.ptr.rev_bo = gid->elem.rev_bo;
/* field is only used for types nested within variants. */
stack_top->u.ptr.field = NULL;
break;
}
case OBJECT_TYPE_SEQUENCE:
{
const char *ptr;
size_t ptr_seq_len;
ptr = *(const char **) (stack_top->u.ptr.ptr + sizeof(unsigned long));
ptr_seq_len = *(unsigned long *) stack_top->u.ptr.ptr;
if (gid->offset >= gid->elem.len * ptr_seq_len) {
ret = -EINVAL;
goto end;
}
ptr = ptr + gid->offset;
stack_top->u.ptr.ptr = ptr;
stack_top->u.ptr.object_type = gid->elem.type;
stack_top->u.ptr.rev_bo = gid->elem.rev_bo;
/* field is only used for types nested within variants. */
stack_top->u.ptr.field = NULL;
break;
}
case OBJECT_TYPE_STRUCT:
printk(KERN_WARNING "Nested structures are not supported yet.\n");
ret = -EINVAL;
goto end;
case OBJECT_TYPE_VARIANT:
default:
printk(KERN_WARNING "Unexpected get index type %d",
(int) stack_top->u.ptr.object_type);
ret = -EINVAL;
goto end;
}
break;
case LOAD_ROOT_CONTEXT:
case LOAD_ROOT_APP_CONTEXT: /* Fall-through */
{
ret = context_get_index(lttng_probe_ctx,
&stack_top->u.ptr,
gid->ctx_index);
if (ret) {
goto end;
}
break;
}
case LOAD_ROOT_PAYLOAD:
stack_top->u.ptr.ptr += gid->offset;
if (gid->elem.type == OBJECT_TYPE_STRING)
stack_top->u.ptr.ptr = *(const char * const *) stack_top->u.ptr.ptr;
stack_top->u.ptr.object_type = gid->elem.type;
stack_top->u.ptr.type = LOAD_OBJECT;
/* field is only used for types nested within variants. */
stack_top->u.ptr.field = NULL;
break;
}
return 0;
end:
return ret;
}
static int dynamic_load_field(struct estack_entry *stack_top)
{
int ret;
switch (stack_top->u.ptr.type) {
case LOAD_OBJECT:
break;
case LOAD_ROOT_CONTEXT:
case LOAD_ROOT_APP_CONTEXT:
case LOAD_ROOT_PAYLOAD:
default:
dbg_printk("Filter warning: cannot load root, missing field name.\n");
ret = -EINVAL;
goto end;
}
switch (stack_top->u.ptr.object_type) {
case OBJECT_TYPE_S8:
dbg_printk("op load field s8\n");
stack_top->u.v = *(int8_t *) stack_top->u.ptr.ptr;
break;
case OBJECT_TYPE_S16:
{
int16_t tmp;
dbg_printk("op load field s16\n");
tmp = *(int16_t *) stack_top->u.ptr.ptr;
if (stack_top->u.ptr.rev_bo)
__swab16s(&tmp);
stack_top->u.v = tmp;
break;
}
case OBJECT_TYPE_S32:
{
int32_t tmp;
dbg_printk("op load field s32\n");
tmp = *(int32_t *) stack_top->u.ptr.ptr;
if (stack_top->u.ptr.rev_bo)
__swab32s(&tmp);
stack_top->u.v = tmp;
break;
}
case OBJECT_TYPE_S64:
{
int64_t tmp;
dbg_printk("op load field s64\n");
tmp = *(int64_t *) stack_top->u.ptr.ptr;
if (stack_top->u.ptr.rev_bo)
__swab64s(&tmp);
stack_top->u.v = tmp;
break;
}
case OBJECT_TYPE_U8:
dbg_printk("op load field u8\n");
stack_top->u.v = *(uint8_t *) stack_top->u.ptr.ptr;
break;
case OBJECT_TYPE_U16:
{
uint16_t tmp;
dbg_printk("op load field s16\n");
tmp = *(uint16_t *) stack_top->u.ptr.ptr;
if (stack_top->u.ptr.rev_bo)
__swab16s(&tmp);
stack_top->u.v = tmp;
break;
}
case OBJECT_TYPE_U32:
{
uint32_t tmp;
dbg_printk("op load field u32\n");
tmp = *(uint32_t *) stack_top->u.ptr.ptr;
if (stack_top->u.ptr.rev_bo)
__swab32s(&tmp);
stack_top->u.v = tmp;
break;
}
case OBJECT_TYPE_U64:
{
uint64_t tmp;
dbg_printk("op load field u64\n");
tmp = *(uint64_t *) stack_top->u.ptr.ptr;
if (stack_top->u.ptr.rev_bo)
__swab64s(&tmp);
stack_top->u.v = tmp;
break;
}
case OBJECT_TYPE_STRING:
{
const char *str;
dbg_printk("op load field string\n");
str = (const char *) stack_top->u.ptr.ptr;
stack_top->u.s.str = str;
if (unlikely(!stack_top->u.s.str)) {
dbg_printk("Filter warning: loading a NULL string.\n");
ret = -EINVAL;
goto end;
}
stack_top->u.s.seq_len = LTTNG_SIZE_MAX;
stack_top->u.s.literal_type =
ESTACK_STRING_LITERAL_TYPE_NONE;
break;
}
case OBJECT_TYPE_STRING_SEQUENCE:
{
const char *ptr;
dbg_printk("op load field string sequence\n");
ptr = stack_top->u.ptr.ptr;
stack_top->u.s.seq_len = *(unsigned long *) ptr;
stack_top->u.s.str = *(const char **) (ptr + sizeof(unsigned long));
if (unlikely(!stack_top->u.s.str)) {
dbg_printk("Filter warning: loading a NULL sequence.\n");
ret = -EINVAL;
goto end;
}
stack_top->u.s.literal_type =
ESTACK_STRING_LITERAL_TYPE_NONE;
break;
}
case OBJECT_TYPE_DYNAMIC:
/*
* Dynamic types in context are looked up
* by context get index.
*/
ret = -EINVAL;
goto end;
case OBJECT_TYPE_DOUBLE:
ret = -EINVAL;
goto end;
case OBJECT_TYPE_SEQUENCE:
case OBJECT_TYPE_ARRAY:
case OBJECT_TYPE_STRUCT:
case OBJECT_TYPE_VARIANT:
printk(KERN_WARNING "Sequences, arrays, struct and variant cannot be loaded (nested types).\n");
ret = -EINVAL;
goto end;
}
return 0;
end:
return ret;
}
/*
* Return 0 (discard), or raise the 0x1 flag (log event).
* Currently, other flags are kept for future extensions and have no
* effect.
*/
uint64_t lttng_filter_interpret_bytecode(void *filter_data,
struct lttng_probe_ctx *lttng_probe_ctx,
const char *filter_stack_data)
{
struct bytecode_runtime *bytecode = filter_data;
void *pc, *next_pc, *start_pc;
int ret = -EINVAL;
uint64_t retval = 0;
struct estack _stack;
struct estack *stack = &_stack;
register int64_t ax = 0, bx = 0;
register int top = FILTER_STACK_EMPTY;
#ifndef INTERPRETER_USE_SWITCH
static void *dispatch[NR_FILTER_OPS] = {
[ FILTER_OP_UNKNOWN ] = &&LABEL_FILTER_OP_UNKNOWN,
[ FILTER_OP_RETURN ] = &&LABEL_FILTER_OP_RETURN,
/* binary */
[ FILTER_OP_MUL ] = &&LABEL_FILTER_OP_MUL,
[ FILTER_OP_DIV ] = &&LABEL_FILTER_OP_DIV,
[ FILTER_OP_MOD ] = &&LABEL_FILTER_OP_MOD,
[ FILTER_OP_PLUS ] = &&LABEL_FILTER_OP_PLUS,
[ FILTER_OP_MINUS ] = &&LABEL_FILTER_OP_MINUS,
[ FILTER_OP_BIT_RSHIFT ] = &&LABEL_FILTER_OP_BIT_RSHIFT,
[ FILTER_OP_BIT_LSHIFT ] = &&LABEL_FILTER_OP_BIT_LSHIFT,
[ FILTER_OP_BIT_AND ] = &&LABEL_FILTER_OP_BIT_AND,
[ FILTER_OP_BIT_OR ] = &&LABEL_FILTER_OP_BIT_OR,
[ FILTER_OP_BIT_XOR ] = &&LABEL_FILTER_OP_BIT_XOR,
/* binary comparators */
[ FILTER_OP_EQ ] = &&LABEL_FILTER_OP_EQ,
[ FILTER_OP_NE ] = &&LABEL_FILTER_OP_NE,
[ FILTER_OP_GT ] = &&LABEL_FILTER_OP_GT,
[ FILTER_OP_LT ] = &&LABEL_FILTER_OP_LT,
[ FILTER_OP_GE ] = &&LABEL_FILTER_OP_GE,
[ FILTER_OP_LE ] = &&LABEL_FILTER_OP_LE,
/* string binary comparator */
[ FILTER_OP_EQ_STRING ] = &&LABEL_FILTER_OP_EQ_STRING,
[ FILTER_OP_NE_STRING ] = &&LABEL_FILTER_OP_NE_STRING,
[ FILTER_OP_GT_STRING ] = &&LABEL_FILTER_OP_GT_STRING,
[ FILTER_OP_LT_STRING ] = &&LABEL_FILTER_OP_LT_STRING,
[ FILTER_OP_GE_STRING ] = &&LABEL_FILTER_OP_GE_STRING,
[ FILTER_OP_LE_STRING ] = &&LABEL_FILTER_OP_LE_STRING,
/* globbing pattern binary comparator */
[ FILTER_OP_EQ_STAR_GLOB_STRING ] = &&LABEL_FILTER_OP_EQ_STAR_GLOB_STRING,
[ FILTER_OP_NE_STAR_GLOB_STRING ] = &&LABEL_FILTER_OP_NE_STAR_GLOB_STRING,
/* s64 binary comparator */
[ FILTER_OP_EQ_S64 ] = &&LABEL_FILTER_OP_EQ_S64,
[ FILTER_OP_NE_S64 ] = &&LABEL_FILTER_OP_NE_S64,
[ FILTER_OP_GT_S64 ] = &&LABEL_FILTER_OP_GT_S64,
[ FILTER_OP_LT_S64 ] = &&LABEL_FILTER_OP_LT_S64,
[ FILTER_OP_GE_S64 ] = &&LABEL_FILTER_OP_GE_S64,
[ FILTER_OP_LE_S64 ] = &&LABEL_FILTER_OP_LE_S64,
/* double binary comparator */
[ FILTER_OP_EQ_DOUBLE ] = &&LABEL_FILTER_OP_EQ_DOUBLE,
[ FILTER_OP_NE_DOUBLE ] = &&LABEL_FILTER_OP_NE_DOUBLE,
[ FILTER_OP_GT_DOUBLE ] = &&LABEL_FILTER_OP_GT_DOUBLE,
[ FILTER_OP_LT_DOUBLE ] = &&LABEL_FILTER_OP_LT_DOUBLE,
[ FILTER_OP_GE_DOUBLE ] = &&LABEL_FILTER_OP_GE_DOUBLE,
[ FILTER_OP_LE_DOUBLE ] = &&LABEL_FILTER_OP_LE_DOUBLE,
/* Mixed S64-double binary comparators */
[ FILTER_OP_EQ_DOUBLE_S64 ] = &&LABEL_FILTER_OP_EQ_DOUBLE_S64,
[ FILTER_OP_NE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_NE_DOUBLE_S64,
[ FILTER_OP_GT_DOUBLE_S64 ] = &&LABEL_FILTER_OP_GT_DOUBLE_S64,
[ FILTER_OP_LT_DOUBLE_S64 ] = &&LABEL_FILTER_OP_LT_DOUBLE_S64,
[ FILTER_OP_GE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_GE_DOUBLE_S64,
[ FILTER_OP_LE_DOUBLE_S64 ] = &&LABEL_FILTER_OP_LE_DOUBLE_S64,
[ FILTER_OP_EQ_S64_DOUBLE ] = &&LABEL_FILTER_OP_EQ_S64_DOUBLE,
[ FILTER_OP_NE_S64_DOUBLE ] = &&LABEL_FILTER_OP_NE_S64_DOUBLE,
[ FILTER_OP_GT_S64_DOUBLE ] = &&LABEL_FILTER_OP_GT_S64_DOUBLE,
[ FILTER_OP_LT_S64_DOUBLE ] = &&LABEL_FILTER_OP_LT_S64_DOUBLE,
[ FILTER_OP_GE_S64_DOUBLE ] = &&LABEL_FILTER_OP_GE_S64_DOUBLE,
[ FILTER_OP_LE_S64_DOUBLE ] = &&LABEL_FILTER_OP_LE_S64_DOUBLE,
/* unary */
[ FILTER_OP_UNARY_PLUS ] = &&LABEL_FILTER_OP_UNARY_PLUS,
[ FILTER_OP_UNARY_MINUS ] = &&LABEL_FILTER_OP_UNARY_MINUS,
[ FILTER_OP_UNARY_NOT ] = &&LABEL_FILTER_OP_UNARY_NOT,
[ FILTER_OP_UNARY_PLUS_S64 ] = &&LABEL_FILTER_OP_UNARY_PLUS_S64,
[ FILTER_OP_UNARY_MINUS_S64 ] = &&LABEL_FILTER_OP_UNARY_MINUS_S64,
[ FILTER_OP_UNARY_NOT_S64 ] = &&LABEL_FILTER_OP_UNARY_NOT_S64,
[ FILTER_OP_UNARY_PLUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_PLUS_DOUBLE,
[ FILTER_OP_UNARY_MINUS_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_MINUS_DOUBLE,
[ FILTER_OP_UNARY_NOT_DOUBLE ] = &&LABEL_FILTER_OP_UNARY_NOT_DOUBLE,
/* logical */
[ FILTER_OP_AND ] = &&LABEL_FILTER_OP_AND,
[ FILTER_OP_OR ] = &&LABEL_FILTER_OP_OR,
/* load field ref */
[ FILTER_OP_LOAD_FIELD_REF ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF,
[ FILTER_OP_LOAD_FIELD_REF_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_STRING,
[ FILTER_OP_LOAD_FIELD_REF_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_SEQUENCE,
[ FILTER_OP_LOAD_FIELD_REF_S64 ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_S64,
[ FILTER_OP_LOAD_FIELD_REF_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_DOUBLE,
/* load from immediate operand */
[ FILTER_OP_LOAD_STRING ] = &&LABEL_FILTER_OP_LOAD_STRING,
[ FILTER_OP_LOAD_STAR_GLOB_STRING ] = &&LABEL_FILTER_OP_LOAD_STAR_GLOB_STRING,
[ FILTER_OP_LOAD_S64 ] = &&LABEL_FILTER_OP_LOAD_S64,
[ FILTER_OP_LOAD_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_DOUBLE,
/* cast */
[ FILTER_OP_CAST_TO_S64 ] = &&LABEL_FILTER_OP_CAST_TO_S64,
[ FILTER_OP_CAST_DOUBLE_TO_S64 ] = &&LABEL_FILTER_OP_CAST_DOUBLE_TO_S64,
[ FILTER_OP_CAST_NOP ] = &&LABEL_FILTER_OP_CAST_NOP,
/* get context ref */
[ FILTER_OP_GET_CONTEXT_REF ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF,
[ FILTER_OP_GET_CONTEXT_REF_STRING ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_STRING,
[ FILTER_OP_GET_CONTEXT_REF_S64 ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_S64,
[ FILTER_OP_GET_CONTEXT_REF_DOUBLE ] = &&LABEL_FILTER_OP_GET_CONTEXT_REF_DOUBLE,
/* load userspace field ref */
[ FILTER_OP_LOAD_FIELD_REF_USER_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_USER_STRING,
[ FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE,
/* Instructions for recursive traversal through composed types. */
[ FILTER_OP_GET_CONTEXT_ROOT ] = &&LABEL_FILTER_OP_GET_CONTEXT_ROOT,
[ FILTER_OP_GET_APP_CONTEXT_ROOT ] = &&LABEL_FILTER_OP_GET_APP_CONTEXT_ROOT,
[ FILTER_OP_GET_PAYLOAD_ROOT ] = &&LABEL_FILTER_OP_GET_PAYLOAD_ROOT,
[ FILTER_OP_GET_SYMBOL ] = &&LABEL_FILTER_OP_GET_SYMBOL,
[ FILTER_OP_GET_SYMBOL_FIELD ] = &&LABEL_FILTER_OP_GET_SYMBOL_FIELD,
[ FILTER_OP_GET_INDEX_U16 ] = &&LABEL_FILTER_OP_GET_INDEX_U16,
[ FILTER_OP_GET_INDEX_U64 ] = &&LABEL_FILTER_OP_GET_INDEX_U64,
[ FILTER_OP_LOAD_FIELD ] = &&LABEL_FILTER_OP_LOAD_FIELD,
[ FILTER_OP_LOAD_FIELD_S8 ] = &&LABEL_FILTER_OP_LOAD_FIELD_S8,
[ FILTER_OP_LOAD_FIELD_S16 ] = &&LABEL_FILTER_OP_LOAD_FIELD_S16,
[ FILTER_OP_LOAD_FIELD_S32 ] = &&LABEL_FILTER_OP_LOAD_FIELD_S32,
[ FILTER_OP_LOAD_FIELD_S64 ] = &&LABEL_FILTER_OP_LOAD_FIELD_S64,
[ FILTER_OP_LOAD_FIELD_U8 ] = &&LABEL_FILTER_OP_LOAD_FIELD_U8,
[ FILTER_OP_LOAD_FIELD_U16 ] = &&LABEL_FILTER_OP_LOAD_FIELD_U16,
[ FILTER_OP_LOAD_FIELD_U32 ] = &&LABEL_FILTER_OP_LOAD_FIELD_U32,
[ FILTER_OP_LOAD_FIELD_U64 ] = &&LABEL_FILTER_OP_LOAD_FIELD_U64,
[ FILTER_OP_LOAD_FIELD_STRING ] = &&LABEL_FILTER_OP_LOAD_FIELD_STRING,
[ FILTER_OP_LOAD_FIELD_SEQUENCE ] = &&LABEL_FILTER_OP_LOAD_FIELD_SEQUENCE,
[ FILTER_OP_LOAD_FIELD_DOUBLE ] = &&LABEL_FILTER_OP_LOAD_FIELD_DOUBLE,
[ FILTER_OP_UNARY_BIT_NOT ] = &&LABEL_FILTER_OP_UNARY_BIT_NOT,
[ FILTER_OP_RETURN_S64 ] = &&LABEL_FILTER_OP_RETURN_S64,
};
#endif /* #ifndef INTERPRETER_USE_SWITCH */
START_OP
OP(FILTER_OP_UNKNOWN):
OP(FILTER_OP_LOAD_FIELD_REF):
OP(FILTER_OP_GET_CONTEXT_REF):
#ifdef INTERPRETER_USE_SWITCH
default:
#endif /* INTERPRETER_USE_SWITCH */
printk(KERN_WARNING "unknown bytecode op %u\n",
(unsigned int) *(filter_opcode_t *) pc);
ret = -EINVAL;
goto end;
OP(FILTER_OP_RETURN):
OP(FILTER_OP_RETURN_S64):
/* LTTNG_FILTER_DISCARD or LTTNG_FILTER_RECORD_FLAG */
retval = !!estack_ax_v;
ret = 0;
goto end;
/* binary */
OP(FILTER_OP_MUL):
OP(FILTER_OP_DIV):
OP(FILTER_OP_MOD):
OP(FILTER_OP_PLUS):
OP(FILTER_OP_MINUS):
printk(KERN_WARNING "unsupported bytecode op %u\n",
(unsigned int) *(filter_opcode_t *) pc);
ret = -EINVAL;
goto end;
OP(FILTER_OP_EQ):
OP(FILTER_OP_NE):
OP(FILTER_OP_GT):
OP(FILTER_OP_LT):
OP(FILTER_OP_GE):
OP(FILTER_OP_LE):
printk(KERN_WARNING "unsupported non-specialized bytecode op %u\n",
(unsigned int) *(filter_opcode_t *) pc);
ret = -EINVAL;
goto end;
OP(FILTER_OP_EQ_STRING):
{
int res;
res = (stack_strcmp(stack, top, "==") == 0);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_NE_STRING):
{
int res;
res = (stack_strcmp(stack, top, "!=") != 0);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_GT_STRING):
{
int res;
res = (stack_strcmp(stack, top, ">") > 0);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_LT_STRING):
{
int res;
res = (stack_strcmp(stack, top, "<") < 0);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_GE_STRING):
{
int res;
res = (stack_strcmp(stack, top, ">=") >= 0);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_LE_STRING):
{
int res;
res = (stack_strcmp(stack, top, "<=") <= 0);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_EQ_STAR_GLOB_STRING):
{
int res;
res = (stack_star_glob_match(stack, top, "==") == 0);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_NE_STAR_GLOB_STRING):
{
int res;
res = (stack_star_glob_match(stack, top, "!=") != 0);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_EQ_S64):
{
int res;
res = (estack_bx_v == estack_ax_v);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_NE_S64):
{
int res;
res = (estack_bx_v != estack_ax_v);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_GT_S64):
{
int res;
res = (estack_bx_v > estack_ax_v);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_LT_S64):
{
int res;
res = (estack_bx_v < estack_ax_v);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_GE_S64):
{
int res;
res = (estack_bx_v >= estack_ax_v);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_LE_S64):
{
int res;
res = (estack_bx_v <= estack_ax_v);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_EQ_DOUBLE):
OP(FILTER_OP_NE_DOUBLE):
OP(FILTER_OP_GT_DOUBLE):
OP(FILTER_OP_LT_DOUBLE):
OP(FILTER_OP_GE_DOUBLE):
OP(FILTER_OP_LE_DOUBLE):
{
BUG_ON(1);
PO;
}
/* Mixed S64-double binary comparators */
OP(FILTER_OP_EQ_DOUBLE_S64):
OP(FILTER_OP_NE_DOUBLE_S64):
OP(FILTER_OP_GT_DOUBLE_S64):
OP(FILTER_OP_LT_DOUBLE_S64):
OP(FILTER_OP_GE_DOUBLE_S64):
OP(FILTER_OP_LE_DOUBLE_S64):
OP(FILTER_OP_EQ_S64_DOUBLE):
OP(FILTER_OP_NE_S64_DOUBLE):
OP(FILTER_OP_GT_S64_DOUBLE):
OP(FILTER_OP_LT_S64_DOUBLE):
OP(FILTER_OP_GE_S64_DOUBLE):
OP(FILTER_OP_LE_S64_DOUBLE):
{
BUG_ON(1);
PO;
}
OP(FILTER_OP_BIT_RSHIFT):
{
int64_t res;
/* Catch undefined behavior. */
if (unlikely(estack_ax_v < 0 || estack_ax_v >= 64)) {
ret = -EINVAL;
goto end;
}
res = ((uint64_t) estack_bx_v >> (uint32_t) estack_ax_v);
estack_pop(stack, top, ax, bx);
estack_ax_v = res;
next_pc += sizeof(struct binary_op);
PO;
}
OP(FILTER_OP_BIT_LSHIFT):
{
int64_t res;
/* Catch undefined behavior. */
if (unlikely(estack_ax_v < 0 || estack_ax_v >= 64)) {
ret = -EINVAL;
goto end;
}
res = ((uint64_t) estack_bx_v << (uint32_t) estack_ax_v);
estack_pop(stack, top, ax, bx);