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lttng-filter-specialize.c
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lttng-filter-specialize.c
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/* SPDX-License-Identifier: MIT
*
* lttng-filter-specialize.c
*
* LTTng modules filter code specializer.
*
* Copyright (C) 2010-2016 Mathieu Desnoyers <[email protected]>
*/
#include <linux/slab.h>
#include <lttng-filter.h>
#include "lib/align.h"
static ssize_t bytecode_reserve_data(struct bytecode_runtime *runtime,
size_t align, size_t len)
{
ssize_t ret;
size_t padding = offset_align(runtime->data_len, align);
size_t new_len = runtime->data_len + padding + len;
size_t new_alloc_len = new_len;
size_t old_alloc_len = runtime->data_alloc_len;
if (new_len > FILTER_MAX_DATA_LEN)
return -EINVAL;
if (new_alloc_len > old_alloc_len) {
char *newptr;
new_alloc_len =
max_t(size_t, 1U << get_count_order(new_alloc_len), old_alloc_len << 1);
newptr = krealloc(runtime->data, new_alloc_len, GFP_KERNEL);
if (!newptr)
return -ENOMEM;
runtime->data = newptr;
/* We zero directly the memory from start of allocation. */
memset(&runtime->data[old_alloc_len], 0, new_alloc_len - old_alloc_len);
runtime->data_alloc_len = new_alloc_len;
}
runtime->data_len += padding;
ret = runtime->data_len;
runtime->data_len += len;
return ret;
}
static ssize_t bytecode_push_data(struct bytecode_runtime *runtime,
const void *p, size_t align, size_t len)
{
ssize_t offset;
offset = bytecode_reserve_data(runtime, align, len);
if (offset < 0)
return -ENOMEM;
memcpy(&runtime->data[offset], p, len);
return offset;
}
static int specialize_load_field(struct vstack_entry *stack_top,
struct load_op *insn)
{
int ret;
switch (stack_top->load.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->load.object_type) {
case OBJECT_TYPE_S8:
dbg_printk("op load field s8\n");
stack_top->type = REG_S64;
if (!stack_top->load.rev_bo)
insn->op = FILTER_OP_LOAD_FIELD_S8;
break;
case OBJECT_TYPE_S16:
dbg_printk("op load field s16\n");
stack_top->type = REG_S64;
if (!stack_top->load.rev_bo)
insn->op = FILTER_OP_LOAD_FIELD_S16;
break;
case OBJECT_TYPE_S32:
dbg_printk("op load field s32\n");
stack_top->type = REG_S64;
if (!stack_top->load.rev_bo)
insn->op = FILTER_OP_LOAD_FIELD_S32;
break;
case OBJECT_TYPE_S64:
dbg_printk("op load field s64\n");
stack_top->type = REG_S64;
if (!stack_top->load.rev_bo)
insn->op = FILTER_OP_LOAD_FIELD_S64;
break;
case OBJECT_TYPE_U8:
dbg_printk("op load field u8\n");
stack_top->type = REG_S64;
insn->op = FILTER_OP_LOAD_FIELD_U8;
break;
case OBJECT_TYPE_U16:
dbg_printk("op load field u16\n");
stack_top->type = REG_S64;
if (!stack_top->load.rev_bo)
insn->op = FILTER_OP_LOAD_FIELD_U16;
break;
case OBJECT_TYPE_U32:
dbg_printk("op load field u32\n");
stack_top->type = REG_S64;
if (!stack_top->load.rev_bo)
insn->op = FILTER_OP_LOAD_FIELD_U32;
break;
case OBJECT_TYPE_U64:
dbg_printk("op load field u64\n");
stack_top->type = REG_S64;
if (!stack_top->load.rev_bo)
insn->op = FILTER_OP_LOAD_FIELD_U64;
break;
case OBJECT_TYPE_DOUBLE:
printk(KERN_WARNING "Double type unsupported\n\n");
ret = -EINVAL;
goto end;
case OBJECT_TYPE_STRING:
dbg_printk("op load field string\n");
stack_top->type = REG_STRING;
insn->op = FILTER_OP_LOAD_FIELD_STRING;
break;
case OBJECT_TYPE_STRING_SEQUENCE:
dbg_printk("op load field string sequence\n");
stack_top->type = REG_STRING;
insn->op = FILTER_OP_LOAD_FIELD_SEQUENCE;
break;
case OBJECT_TYPE_DYNAMIC:
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;
}
static int specialize_get_index_object_type(enum object_type *otype,
int signedness, uint32_t elem_len)
{
switch (elem_len) {
case 8:
if (signedness)
*otype = OBJECT_TYPE_S8;
else
*otype = OBJECT_TYPE_U8;
break;
case 16:
if (signedness)
*otype = OBJECT_TYPE_S16;
else
*otype = OBJECT_TYPE_U16;
break;
case 32:
if (signedness)
*otype = OBJECT_TYPE_S32;
else
*otype = OBJECT_TYPE_U32;
break;
case 64:
if (signedness)
*otype = OBJECT_TYPE_S64;
else
*otype = OBJECT_TYPE_U64;
break;
default:
return -EINVAL;
}
return 0;
}
static int specialize_get_index(struct bytecode_runtime *runtime,
struct load_op *insn, uint64_t index,
struct vstack_entry *stack_top,
int idx_len)
{
int ret;
struct filter_get_index_data gid;
ssize_t data_offset;
memset(&gid, 0, sizeof(gid));
switch (stack_top->load.type) {
case LOAD_OBJECT:
switch (stack_top->load.object_type) {
case OBJECT_TYPE_ARRAY:
{
const struct lttng_event_field *field;
uint32_t elem_len, num_elems;
int signedness;
field = stack_top->load.field;
elem_len = field->type.u.array.elem_type.u.basic.integer.size;
signedness = field->type.u.array.elem_type.u.basic.integer.signedness;
num_elems = field->type.u.array.length;
if (index >= num_elems) {
ret = -EINVAL;
goto end;
}
ret = specialize_get_index_object_type(&stack_top->load.object_type,
signedness, elem_len);
if (ret)
goto end;
gid.offset = index * (elem_len / CHAR_BIT);
gid.array_len = num_elems * (elem_len / CHAR_BIT);
gid.elem.type = stack_top->load.object_type;
gid.elem.len = elem_len;
if (field->type.u.array.elem_type.u.basic.integer.reverse_byte_order)
gid.elem.rev_bo = true;
stack_top->load.rev_bo = gid.elem.rev_bo;
break;
}
case OBJECT_TYPE_SEQUENCE:
{
const struct lttng_event_field *field;
uint32_t elem_len;
int signedness;
field = stack_top->load.field;
elem_len = field->type.u.sequence.elem_type.u.basic.integer.size;
signedness = field->type.u.sequence.elem_type.u.basic.integer.signedness;
ret = specialize_get_index_object_type(&stack_top->load.object_type,
signedness, elem_len);
if (ret)
goto end;
gid.offset = index * (elem_len / CHAR_BIT);
gid.elem.type = stack_top->load.object_type;
gid.elem.len = elem_len;
if (field->type.u.sequence.elem_type.u.basic.integer.reverse_byte_order)
gid.elem.rev_bo = true;
stack_top->load.rev_bo = gid.elem.rev_bo;
break;
}
case OBJECT_TYPE_STRUCT:
/* Only generated by the specialize phase. */
case OBJECT_TYPE_VARIANT: /* Fall-through */
default:
printk(KERN_WARNING "Unexpected get index type %d",
(int) stack_top->load.object_type);
ret = -EINVAL;
goto end;
}
break;
case LOAD_ROOT_CONTEXT:
case LOAD_ROOT_APP_CONTEXT:
case LOAD_ROOT_PAYLOAD:
printk(KERN_WARNING "Index lookup for root field not implemented yet.\n");
ret = -EINVAL;
goto end;
}
data_offset = bytecode_push_data(runtime, &gid,
__alignof__(gid), sizeof(gid));
if (data_offset < 0) {
ret = -EINVAL;
goto end;
}
switch (idx_len) {
case 2:
((struct get_index_u16 *) insn->data)->index = data_offset;
break;
case 8:
((struct get_index_u64 *) insn->data)->index = data_offset;
break;
default:
ret = -EINVAL;
goto end;
}
return 0;
end:
return ret;
}
static int specialize_context_lookup_name(struct bytecode_runtime *bytecode,
struct load_op *insn)
{
uint16_t offset;
const char *name;
offset = ((struct get_symbol *) insn->data)->offset;
name = bytecode->p.bc->bc.data + bytecode->p.bc->bc.reloc_offset + offset;
return lttng_get_context_index(lttng_static_ctx, name);
}
static int specialize_load_object(const struct lttng_event_field *field,
struct vstack_load *load, bool is_context)
{
load->type = LOAD_OBJECT;
/*
* LTTng-UST layout all integer fields as s64 on the stack for the filter.
*/
switch (field->type.atype) {
case atype_integer:
if (field->type.u.basic.integer.signedness)
load->object_type = OBJECT_TYPE_S64;
else
load->object_type = OBJECT_TYPE_U64;
load->rev_bo = false;
break;
case atype_enum:
{
const struct lttng_integer_type *itype =
&field->type.u.basic.enumeration.container_type;
if (itype->signedness)
load->object_type = OBJECT_TYPE_S64;
else
load->object_type = OBJECT_TYPE_U64;
load->rev_bo = false;
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 (is_context) {
load->object_type = OBJECT_TYPE_STRING;
} else {
if (field->type.u.array.elem_type.u.basic.integer.encoding == lttng_encode_none) {
load->object_type = OBJECT_TYPE_ARRAY;
load->field = field;
} else {
load->object_type = OBJECT_TYPE_STRING_SEQUENCE;
}
}
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 (is_context) {
load->object_type = OBJECT_TYPE_STRING;
} else {
if (field->type.u.sequence.elem_type.u.basic.integer.encoding == lttng_encode_none) {
load->object_type = OBJECT_TYPE_SEQUENCE;
load->field = field;
} else {
load->object_type = OBJECT_TYPE_STRING_SEQUENCE;
}
}
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:
load->object_type = OBJECT_TYPE_STRING;
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 specialize_context_lookup(struct bytecode_runtime *runtime,
struct load_op *insn,
struct vstack_load *load)
{
int idx, ret;
struct lttng_ctx_field *ctx_field;
struct lttng_event_field *field;
struct filter_get_index_data gid;
ssize_t data_offset;
idx = specialize_context_lookup_name(runtime, insn);
if (idx < 0) {
return -ENOENT;
}
ctx_field = <tng_static_ctx->fields[idx];
field = &ctx_field->event_field;
ret = specialize_load_object(field, load, true);
if (ret)
return ret;
/* Specialize each get_symbol into a get_index. */
insn->op = FILTER_OP_GET_INDEX_U16;
memset(&gid, 0, sizeof(gid));
gid.ctx_index = idx;
gid.elem.type = load->object_type;
data_offset = bytecode_push_data(runtime, &gid,
__alignof__(gid), sizeof(gid));
if (data_offset < 0) {
return -EINVAL;
}
((struct get_index_u16 *) insn->data)->index = data_offset;
return 0;
}
static int specialize_event_payload_lookup(struct lttng_event *event,
struct bytecode_runtime *runtime,
struct load_op *insn,
struct vstack_load *load)
{
const char *name;
uint16_t offset;
const struct lttng_event_desc *desc = event->desc;
unsigned int i, nr_fields;
bool found = false;
uint32_t field_offset = 0;
const struct lttng_event_field *field;
int ret;
struct filter_get_index_data gid;
ssize_t data_offset;
nr_fields = desc->nr_fields;
offset = ((struct get_symbol *) insn->data)->offset;
name = runtime->p.bc->bc.data + runtime->p.bc->bc.reloc_offset + offset;
for (i = 0; i < nr_fields; i++) {
field = &desc->fields[i];
if (!strcmp(field->name, name)) {
found = true;
break;
}
/* compute field offset on stack */
switch (field->type.atype) {
case atype_integer:
case atype_enum:
field_offset += sizeof(int64_t);
break;
case atype_array:
case atype_sequence:
case atype_array_bitfield:
case atype_sequence_bitfield:
field_offset += sizeof(unsigned long);
field_offset += sizeof(void *);
break;
case atype_string:
field_offset += sizeof(void *);
break;
default:
ret = -EINVAL;
goto end;
}
}
if (!found) {
ret = -EINVAL;
goto end;
}
ret = specialize_load_object(field, load, false);
if (ret)
goto end;
/* Specialize each get_symbol into a get_index. */
insn->op = FILTER_OP_GET_INDEX_U16;
memset(&gid, 0, sizeof(gid));
gid.offset = field_offset;
gid.elem.type = load->object_type;
data_offset = bytecode_push_data(runtime, &gid,
__alignof__(gid), sizeof(gid));
if (data_offset < 0) {
ret = -EINVAL;
goto end;
}
((struct get_index_u16 *) insn->data)->index = data_offset;
ret = 0;
end:
return ret;
}
int lttng_filter_specialize_bytecode(struct lttng_event *event,
struct bytecode_runtime *bytecode)
{
void *pc, *next_pc, *start_pc;
int ret = -EINVAL;
struct vstack _stack;
struct vstack *stack = &_stack;
vstack_init(stack);
start_pc = &bytecode->code[0];
for (pc = next_pc = start_pc; pc - start_pc < bytecode->len;
pc = next_pc) {
switch (*(filter_opcode_t *) pc) {
case FILTER_OP_UNKNOWN:
default:
printk(KERN_WARNING "unknown bytecode op %u\n",
(unsigned int) *(filter_opcode_t *) pc);
ret = -EINVAL;
goto end;
case FILTER_OP_RETURN:
case FILTER_OP_RETURN_S64:
ret = 0;
goto end;
/* binary */
case FILTER_OP_MUL:
case FILTER_OP_DIV:
case FILTER_OP_MOD:
case FILTER_OP_PLUS:
case FILTER_OP_MINUS:
printk(KERN_WARNING "unsupported bytecode op %u\n",
(unsigned int) *(filter_opcode_t *) pc);
ret = -EINVAL;
goto end;
case FILTER_OP_EQ:
{
struct binary_op *insn = (struct binary_op *) pc;
switch(vstack_ax(stack)->type) {
default:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_STRING:
if (vstack_bx(stack)->type == REG_STAR_GLOB_STRING)
insn->op = FILTER_OP_EQ_STAR_GLOB_STRING;
else
insn->op = FILTER_OP_EQ_STRING;
break;
case REG_STAR_GLOB_STRING:
insn->op = FILTER_OP_EQ_STAR_GLOB_STRING;
break;
case REG_S64:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_EQ_S64;
else
insn->op = FILTER_OP_EQ_DOUBLE_S64;
break;
case REG_DOUBLE:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_EQ_S64_DOUBLE;
else
insn->op = FILTER_OP_EQ_DOUBLE;
break;
}
/* Pop 2, push 1 */
if (vstack_pop(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_S64;
next_pc += sizeof(struct binary_op);
break;
}
case FILTER_OP_NE:
{
struct binary_op *insn = (struct binary_op *) pc;
switch(vstack_ax(stack)->type) {
default:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_STRING:
if (vstack_bx(stack)->type == REG_STAR_GLOB_STRING)
insn->op = FILTER_OP_NE_STAR_GLOB_STRING;
else
insn->op = FILTER_OP_NE_STRING;
break;
case REG_STAR_GLOB_STRING:
insn->op = FILTER_OP_NE_STAR_GLOB_STRING;
break;
case REG_S64:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_NE_S64;
else
insn->op = FILTER_OP_NE_DOUBLE_S64;
break;
case REG_DOUBLE:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_NE_S64_DOUBLE;
else
insn->op = FILTER_OP_NE_DOUBLE;
break;
}
/* Pop 2, push 1 */
if (vstack_pop(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_S64;
next_pc += sizeof(struct binary_op);
break;
}
case FILTER_OP_GT:
{
struct binary_op *insn = (struct binary_op *) pc;
switch(vstack_ax(stack)->type) {
default:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_STAR_GLOB_STRING:
printk(KERN_WARNING "invalid register type for > binary operator\n");
ret = -EINVAL;
goto end;
case REG_STRING:
insn->op = FILTER_OP_GT_STRING;
break;
case REG_S64:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_GT_S64;
else
insn->op = FILTER_OP_GT_DOUBLE_S64;
break;
case REG_DOUBLE:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_GT_S64_DOUBLE;
else
insn->op = FILTER_OP_GT_DOUBLE;
break;
}
/* Pop 2, push 1 */
if (vstack_pop(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_S64;
next_pc += sizeof(struct binary_op);
break;
}
case FILTER_OP_LT:
{
struct binary_op *insn = (struct binary_op *) pc;
switch(vstack_ax(stack)->type) {
default:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_STAR_GLOB_STRING:
printk(KERN_WARNING "invalid register type for < binary operator\n");
ret = -EINVAL;
goto end;
case REG_STRING:
insn->op = FILTER_OP_LT_STRING;
break;
case REG_S64:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_LT_S64;
else
insn->op = FILTER_OP_LT_DOUBLE_S64;
break;
case REG_DOUBLE:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_LT_S64_DOUBLE;
else
insn->op = FILTER_OP_LT_DOUBLE;
break;
}
/* Pop 2, push 1 */
if (vstack_pop(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_S64;
next_pc += sizeof(struct binary_op);
break;
}
case FILTER_OP_GE:
{
struct binary_op *insn = (struct binary_op *) pc;
switch(vstack_ax(stack)->type) {
default:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_STAR_GLOB_STRING:
printk(KERN_WARNING "invalid register type for >= binary operator\n");
ret = -EINVAL;
goto end;
case REG_STRING:
insn->op = FILTER_OP_GE_STRING;
break;
case REG_S64:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_GE_S64;
else
insn->op = FILTER_OP_GE_DOUBLE_S64;
break;
case REG_DOUBLE:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_GE_S64_DOUBLE;
else
insn->op = FILTER_OP_GE_DOUBLE;
break;
}
/* Pop 2, push 1 */
if (vstack_pop(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_S64;
next_pc += sizeof(struct binary_op);
break;
}
case FILTER_OP_LE:
{
struct binary_op *insn = (struct binary_op *) pc;
switch(vstack_ax(stack)->type) {
default:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_STAR_GLOB_STRING:
printk(KERN_WARNING "invalid register type for <= binary operator\n");
ret = -EINVAL;
goto end;
case REG_STRING:
insn->op = FILTER_OP_LE_STRING;
break;
case REG_S64:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_LE_S64;
else
insn->op = FILTER_OP_LE_DOUBLE_S64;
break;
case REG_DOUBLE:
if (vstack_bx(stack)->type == REG_S64)
insn->op = FILTER_OP_LE_S64_DOUBLE;
else
insn->op = FILTER_OP_LE_DOUBLE;
break;
}
vstack_ax(stack)->type = REG_S64;
next_pc += sizeof(struct binary_op);
break;
}
case FILTER_OP_EQ_STRING:
case FILTER_OP_NE_STRING:
case FILTER_OP_GT_STRING:
case FILTER_OP_LT_STRING:
case FILTER_OP_GE_STRING:
case FILTER_OP_LE_STRING:
case FILTER_OP_EQ_STAR_GLOB_STRING:
case FILTER_OP_NE_STAR_GLOB_STRING:
case FILTER_OP_EQ_S64:
case FILTER_OP_NE_S64:
case FILTER_OP_GT_S64:
case FILTER_OP_LT_S64:
case FILTER_OP_GE_S64:
case FILTER_OP_LE_S64:
case FILTER_OP_EQ_DOUBLE:
case FILTER_OP_NE_DOUBLE:
case FILTER_OP_GT_DOUBLE:
case FILTER_OP_LT_DOUBLE:
case FILTER_OP_GE_DOUBLE:
case FILTER_OP_LE_DOUBLE:
case FILTER_OP_EQ_DOUBLE_S64:
case FILTER_OP_NE_DOUBLE_S64:
case FILTER_OP_GT_DOUBLE_S64:
case FILTER_OP_LT_DOUBLE_S64:
case FILTER_OP_GE_DOUBLE_S64:
case FILTER_OP_LE_DOUBLE_S64:
case FILTER_OP_EQ_S64_DOUBLE:
case FILTER_OP_NE_S64_DOUBLE:
case FILTER_OP_GT_S64_DOUBLE:
case FILTER_OP_LT_S64_DOUBLE:
case FILTER_OP_GE_S64_DOUBLE:
case FILTER_OP_LE_S64_DOUBLE:
case FILTER_OP_BIT_RSHIFT:
case FILTER_OP_BIT_LSHIFT:
case FILTER_OP_BIT_AND:
case FILTER_OP_BIT_OR:
case FILTER_OP_BIT_XOR:
{
/* Pop 2, push 1 */
if (vstack_pop(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_S64;
next_pc += sizeof(struct binary_op);
break;
}
/* unary */
case FILTER_OP_UNARY_PLUS:
{
struct unary_op *insn = (struct unary_op *) pc;
switch(vstack_ax(stack)->type) {
default:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_S64:
insn->op = FILTER_OP_UNARY_PLUS_S64;
break;
case REG_DOUBLE:
insn->op = FILTER_OP_UNARY_PLUS_DOUBLE;
break;
}
/* Pop 1, push 1 */
next_pc += sizeof(struct unary_op);
break;
}
case FILTER_OP_UNARY_MINUS:
{
struct unary_op *insn = (struct unary_op *) pc;
switch(vstack_ax(stack)->type) {
default:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_S64:
insn->op = FILTER_OP_UNARY_MINUS_S64;
break;
case REG_DOUBLE:
insn->op = FILTER_OP_UNARY_MINUS_DOUBLE;
break;
}
/* Pop 1, push 1 */
next_pc += sizeof(struct unary_op);
break;
}
case FILTER_OP_UNARY_NOT:
{
struct unary_op *insn = (struct unary_op *) pc;
switch(vstack_ax(stack)->type) {
default:
printk(KERN_WARNING "unknown register type\n");
ret = -EINVAL;
goto end;
case REG_S64:
insn->op = FILTER_OP_UNARY_NOT_S64;
break;
case REG_DOUBLE:
insn->op = FILTER_OP_UNARY_NOT_DOUBLE;
break;
}
/* Pop 1, push 1 */
next_pc += sizeof(struct unary_op);
break;
}
case FILTER_OP_UNARY_BIT_NOT:
{
/* Pop 1, push 1 */
next_pc += sizeof(struct unary_op);
break;
}
case FILTER_OP_UNARY_PLUS_S64:
case FILTER_OP_UNARY_MINUS_S64:
case FILTER_OP_UNARY_NOT_S64:
case FILTER_OP_UNARY_PLUS_DOUBLE:
case FILTER_OP_UNARY_MINUS_DOUBLE:
case FILTER_OP_UNARY_NOT_DOUBLE:
{
/* Pop 1, push 1 */
next_pc += sizeof(struct unary_op);
break;
}
/* logical */
case FILTER_OP_AND:
case FILTER_OP_OR:
{
/* Continue to next instruction */
/* Pop 1 when jump not taken */
if (vstack_pop(stack)) {
ret = -EINVAL;
goto end;
}
next_pc += sizeof(struct logical_op);
break;
}
/* load field ref */
case FILTER_OP_LOAD_FIELD_REF:
{
printk(KERN_WARNING "Unknown field ref type\n");
ret = -EINVAL;
goto end;
}
/* get context ref */
case FILTER_OP_GET_CONTEXT_REF:
{
printk(KERN_WARNING "Unknown get context ref type\n");
ret = -EINVAL;
goto end;
}
case FILTER_OP_LOAD_FIELD_REF_STRING:
case FILTER_OP_LOAD_FIELD_REF_SEQUENCE:
case FILTER_OP_GET_CONTEXT_REF_STRING:
case FILTER_OP_LOAD_FIELD_REF_USER_STRING:
case FILTER_OP_LOAD_FIELD_REF_USER_SEQUENCE:
{
if (vstack_push(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_STRING;
next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
break;
}
case FILTER_OP_LOAD_FIELD_REF_S64:
case FILTER_OP_GET_CONTEXT_REF_S64:
{
if (vstack_push(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_S64;
next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
break;
}
case FILTER_OP_LOAD_FIELD_REF_DOUBLE:
case FILTER_OP_GET_CONTEXT_REF_DOUBLE:
{
if (vstack_push(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_DOUBLE;
next_pc += sizeof(struct load_op) + sizeof(struct field_ref);
break;
}
/* load from immediate operand */
case FILTER_OP_LOAD_STRING:
{
struct load_op *insn = (struct load_op *) pc;
if (vstack_push(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_STRING;
next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
break;
}
case FILTER_OP_LOAD_STAR_GLOB_STRING:
{
struct load_op *insn = (struct load_op *) pc;
if (vstack_push(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_STAR_GLOB_STRING;
next_pc += sizeof(struct load_op) + strlen(insn->data) + 1;
break;
}
case FILTER_OP_LOAD_S64:
{
if (vstack_push(stack)) {
ret = -EINVAL;
goto end;
}
vstack_ax(stack)->type = REG_S64;
next_pc += sizeof(struct load_op)
+ sizeof(struct literal_numeric);
break;
}
case FILTER_OP_LOAD_DOUBLE:
{
if (vstack_push(stack)) {
ret = -EINVAL;
goto end;
}