+ }
+ break;
+ }
+ case FILTER_OP_CAST_NOP:
+ {
+ break;
+ }
+
+ /* get context ref */
+ case FILTER_OP_GET_CONTEXT_REF:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+ struct field_ref *ref = (struct field_ref *) insn->data;
+
+ dbg_printf("Validate get context ref offset %u type dynamic\n",
+ ref->offset);
+ break;
+ }
+ case FILTER_OP_GET_CONTEXT_REF_STRING:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+ struct field_ref *ref = (struct field_ref *) insn->data;
+
+ dbg_printf("Validate get context ref offset %u type string\n",
+ ref->offset);
+ break;
+ }
+ case FILTER_OP_GET_CONTEXT_REF_S64:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+ struct field_ref *ref = (struct field_ref *) insn->data;
+
+ dbg_printf("Validate get context ref offset %u type s64\n",
+ ref->offset);
+ break;
+ }
+ case FILTER_OP_GET_CONTEXT_REF_DOUBLE:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+ struct field_ref *ref = (struct field_ref *) insn->data;
+
+ dbg_printf("Validate get context ref offset %u type double\n",
+ ref->offset);
+ break;
+ }
+
+ /*
+ * Instructions for recursive traversal through composed types.
+ */
+ case FILTER_OP_GET_CONTEXT_ROOT:
+ {
+ dbg_printf("Validate get context root\n");
+ break;
+ }
+ case FILTER_OP_GET_APP_CONTEXT_ROOT:
+ {
+ dbg_printf("Validate get app context root\n");
+ break;
+ }
+ case FILTER_OP_GET_PAYLOAD_ROOT:
+ {
+ dbg_printf("Validate get payload root\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD:
+ {
+ /*
+ * We tolerate that field type is unknown at validation,
+ * because we are performing the load specialization in
+ * a phase after validation.
+ */
+ dbg_printf("Validate load field\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_S8:
+ {
+ dbg_printf("Validate load field s8\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_S16:
+ {
+ dbg_printf("Validate load field s16\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_S32:
+ {
+ dbg_printf("Validate load field s32\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_S64:
+ {
+ dbg_printf("Validate load field s64\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_U8:
+ {
+ dbg_printf("Validate load field u8\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_U16:
+ {
+ dbg_printf("Validate load field u16\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_U32:
+ {
+ dbg_printf("Validate load field u32\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_U64:
+ {
+ dbg_printf("Validate load field u64\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_STRING:
+ {
+ dbg_printf("Validate load field string\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_SEQUENCE:
+ {
+ dbg_printf("Validate load field sequence\n");
+ break;
+ }
+ case FILTER_OP_LOAD_FIELD_DOUBLE:
+ {
+ dbg_printf("Validate load field double\n");
+ break;
+ }
+
+ case FILTER_OP_GET_SYMBOL:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+ struct get_symbol *sym = (struct get_symbol *) insn->data;
+
+ dbg_printf("Validate get symbol offset %u\n", sym->offset);
+ break;
+ }
+
+ case FILTER_OP_GET_SYMBOL_FIELD:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+ struct get_symbol *sym = (struct get_symbol *) insn->data;
+
+ dbg_printf("Validate get symbol field offset %u\n", sym->offset);
+ break;
+ }
+
+ case FILTER_OP_GET_INDEX_U16:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+ struct get_index_u16 *get_index = (struct get_index_u16 *) insn->data;
+
+ dbg_printf("Validate get index u16 index %u\n", get_index->index);
+ break;
+ }
+
+ case FILTER_OP_GET_INDEX_U64:
+ {
+ struct load_op *insn = (struct load_op *) pc;
+ struct get_index_u64 *get_index = (struct get_index_u64 *) insn->data;
+
+ dbg_printf("Validate get index u64 index %" PRIu64 "\n", get_index->index);
+ break;
+ }
+ }
+end:
+ return ret;
+}
+
+/*
+ * Return value:
+ * 0: success
+ * <0: error
+ */
+static
+int validate_instruction_all_contexts(struct bytecode_runtime *bytecode,
+ struct cds_lfht *merge_points,
+ struct vstack *stack,
+ char *start_pc,
+ char *pc)
+{
+ int ret;
+ unsigned long target_pc = pc - start_pc;
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *node;
+ struct lfht_mp_node *mp_node;
+ unsigned long hash;
+
+ /* Validate the context resulting from the previous instruction */
+ ret = validate_instruction_context(bytecode, stack, start_pc, pc);
+ if (ret < 0)
+ return ret;
+
+ /* Validate merge points */
+ hash = lttng_hash_mix((const char *) target_pc, sizeof(target_pc),
+ lttng_hash_seed);
+ cds_lfht_lookup(merge_points, hash, lttng_hash_match,
+ (const char *) target_pc, &iter);
+ node = cds_lfht_iter_get_node(&iter);
+ if (node) {
+ mp_node = caa_container_of(node, struct lfht_mp_node, node);
+
+ dbg_printf("Filter: validate merge point at offset %lu\n",
+ target_pc);
+ if (merge_points_compare(stack, &mp_node->stack)) {
+ ERR("Merge points differ for offset %lu\n",
+ target_pc);
+ return -EINVAL;
+ }
+ /* Once validated, we can remove the merge point */
+ dbg_printf("Filter: remove merge point at offset %lu\n",
+ target_pc);
+ ret = cds_lfht_del(merge_points, node);
+ assert(!ret);
+ }
+ return 0;
+}
+
+/*
+ * Return value:
+ * >0: going to next insn.
+ * 0: success, stop iteration.
+ * <0: error
+ */
+static
+int exec_insn(struct bytecode_runtime *bytecode,
+ struct cds_lfht *merge_points,
+ struct vstack *stack,
+ char **_next_pc,
+ char *pc)
+{
+ int ret = 1;
+ char *next_pc = *_next_pc;
+
+ switch (*(filter_opcode_t *) pc) {
+ case FILTER_OP_UNKNOWN:
+ default:
+ {
+ ERR("unknown bytecode op %u\n",
+ (unsigned int) *(filter_opcode_t *) pc);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ case FILTER_OP_RETURN:
+ {
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (vstack_ax(stack)->type) {
+ case REG_S64:
+ case REG_UNKNOWN:
+ break;
+ default:
+ ERR("Unexpected register type %d at end of bytecode\n",
+ (int) vstack_ax(stack)->type);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ ret = 0;
+ goto end;
+ }
+ case FILTER_OP_RETURN_S64:
+ {
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (vstack_ax(stack)->type) {
+ case REG_S64:
+ break;
+ default:
+ case REG_UNKNOWN:
+ ERR("Unexpected register type %d at end of bytecode\n",
+ (int) vstack_ax(stack)->type);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ 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:
+ {
+ ERR("unsupported bytecode op %u\n",
+ (unsigned int) *(filter_opcode_t *) pc);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ case FILTER_OP_EQ:
+ case FILTER_OP_NE:
+ case FILTER_OP_GT:
+ case FILTER_OP_LT:
+ case FILTER_OP_GE:
+ case FILTER_OP_LE:
+ 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;
+ }
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (vstack_ax(stack)->type) {
+ case REG_S64:
+ case REG_DOUBLE:
+ case REG_STRING:
+ case REG_STAR_GLOB_STRING:
+ case REG_UNKNOWN:
+ break;
+ default:
+ ERR("Unexpected register type %d for operation\n",
+ (int) vstack_ax(stack)->type);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ vstack_ax(stack)->type = REG_S64;
+ next_pc += sizeof(struct binary_op);
+ break;
+ }
+
+ /* unary */
+ case FILTER_OP_UNARY_PLUS:
+ case FILTER_OP_UNARY_MINUS:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (vstack_ax(stack)->type) {
+ case REG_UNKNOWN:
+ case REG_DOUBLE:
+ case REG_S64:
+ break;
+ default:
+ ERR("Unexpected register type %d for operation\n",
+ (int) vstack_ax(stack)->type);
+ ret = -EINVAL;
+ goto end;
+ }
+ vstack_ax(stack)->type = REG_UNKNOWN;
+ 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:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (vstack_ax(stack)->type) {
+ case REG_S64:
+ break;
+ default:
+ ERR("Unexpected register type %d for operation\n",
+ (int) vstack_ax(stack)->type);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ vstack_ax(stack)->type = REG_S64;
+ next_pc += sizeof(struct unary_op);
+ break;
+ }
+
+ case FILTER_OP_UNARY_NOT:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (vstack_ax(stack)->type) {
+ case REG_UNKNOWN:
+ case REG_DOUBLE:
+ case REG_S64:
+ break;
+ default:
+ ERR("Unexpected register type %d for operation\n",
+ (int) vstack_ax(stack)->type);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ vstack_ax(stack)->type = REG_S64;
+ next_pc += sizeof(struct unary_op);
+ break;
+ }
+
+ case FILTER_OP_UNARY_BIT_NOT:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (vstack_ax(stack)->type) {
+ case REG_UNKNOWN:
+ case REG_S64:
+ break;
+ case REG_DOUBLE:
+ default:
+ ERR("Unexpected register type %d for operation\n",
+ (int) vstack_ax(stack)->type);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ vstack_ax(stack)->type = REG_S64;
+ next_pc += sizeof(struct unary_op);
+ break;
+ }
+
+ case FILTER_OP_UNARY_NOT_DOUBLE:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (vstack_ax(stack)->type) {
+ case REG_DOUBLE:
+ break;
+ default:
+ ERR("Incorrect register type %d for operation\n",
+ (int) vstack_ax(stack)->type);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ vstack_ax(stack)->type = REG_S64;
+ next_pc += sizeof(struct unary_op);
+ break;
+ }
+
+ case FILTER_OP_UNARY_PLUS_DOUBLE:
+ case FILTER_OP_UNARY_MINUS_DOUBLE:
+ {
+ /* Pop 1, push 1 */
+ if (!vstack_ax(stack)) {
+ ERR("Empty stack\n");
+ ret = -EINVAL;
+ goto end;
+ }
+ switch (vstack_ax(stack)->type) {
+ case REG_DOUBLE: