/*******************************************************************************
*
* Module Name: dsutils - Dispatcher utilities
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#include <acpi/acparser.h>
#include <acpi/amlcode.h>
#include <acpi/acdispat.h>
#include <acpi/acinterp.h>
#include <acpi/acnamesp.h>
#include <acpi/acdebug.h>
#define _COMPONENT ACPI_DISPATCHER
ACPI_MODULE_NAME ("dsutils")
/*******************************************************************************
*
* FUNCTION: acpi_ds_clear_implicit_return
*
* PARAMETERS: walk_state - Current State
*
* RETURN: None.
*
* DESCRIPTION: Clear and remove a reference on an implicit return value. Used
* to delete "stale" return values (if enabled, the return value
* from every operator is saved at least momentarily, in case the
* parent method exits.)
*
******************************************************************************/
void
acpi_ds_clear_implicit_return (
struct acpi_walk_state *walk_state)
{
ACPI_FUNCTION_NAME ("ds_clear_implicit_return");
/*
* Slack must be enabled for this feature
*/
if (!acpi_gbl_enable_interpreter_slack) {
return;
}
if (walk_state->implicit_return_obj) {
/*
* Delete any "stale" implicit return. However, in
* complex statements, the implicit return value can be
* bubbled up several levels.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
"Removing reference on stale implicit return obj %p\n",
walk_state->implicit_return_obj));
acpi_ut_remove_reference (walk_state->implicit_return_obj);
walk_state->implicit_return_obj = NULL;
}
}
#ifndef ACPI_NO_METHOD_EXECUTION
/*******************************************************************************
*
* FUNCTION: acpi_ds_do_implicit_return
*
* PARAMETERS: return_desc - The return value
* walk_state - Current State
* add_reference - True if a reference should be added to the
* return object
*
* RETURN: TRUE if implicit return enabled, FALSE otherwise
*
* DESCRIPTION: Implements the optional "implicit return". We save the result
* of every ASL operator and control method invocation in case the
* parent method exit. Before storing a new return value, we
* delete the previous return value.
*
******************************************************************************/
u8
acpi_ds_do_implicit_return (
union acpi_operand_object *return_desc,
struct acpi_walk_state *walk_state,
u8 add_reference)
{
ACPI_FUNCTION_NAME ("ds_do_implicit_return");
/*
* Slack must be enabled for this feature, and we must
* have a valid return object
*/
if ((!acpi_gbl_enable_interpreter_slack) ||
(!return_desc)) {
return (FALSE);
}
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
"Result %p will be implicitly returned; Prev=%p\n",
return_desc,
walk_state->implicit_return_obj));
/*
* Delete any "stale" implicit return value first. However, in
* complex statements, the implicit return value can be
* bubbled up several levels, so we don't clear the value if it
* is the same as the return_desc.
*/
if (walk_state->implicit_return_obj) {
if (walk_state->implicit_return_obj == return_desc) {
return (TRUE);
}
acpi_ds_clear_implicit_return (walk_state);
}
/* Save the implicit return value, add a reference if requested */
walk_state->implicit_return_obj = return_desc;
if (add_reference) {
acpi_ut_add_reference (return_desc);
}
return (TRUE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_is_result_used
*
* PARAMETERS: Op - Current Op
* walk_state - Current State
*
* RETURN: TRUE if result is used, FALSE otherwise
*
* DESCRIPTION: Check if a result object will be used by the parent
*
******************************************************************************/
u8
acpi_ds_is_result_used (
union acpi_parse_object *op,
struct acpi_walk_state *walk_state)
{
const struct acpi_opcode_info *parent_info;
ACPI_FUNCTION_TRACE_PTR ("ds_is_result_used", op);
/* Must have both an Op and a Result Object */
if (!op) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null Op\n"));
return_VALUE (TRUE);
}
/*
* We know that this operator is not a
* Return() operator (would not come here.) The following code is the
* optional support for a so-called "implicit return". Some AML code
* assumes that the last value of the method is "implicitly" returned
* to the caller. Just save the last result as the return value.
* NOTE: this is optional because the ASL language does not actually
* support this behavior.
*/
acpi_ds_do_implicit_return (walk_state->result_obj, walk_state, TRUE);
/*
* Now determine if the parent will use the result
*
* If there is no parent, or the parent is a scope_op, we are executing
* at the method level. An executing method typically has no parent,
* since each method is parsed separately. A method invoked externally
* via execute_control_method has a scope_op as the parent.
*/
if ((!op->common.parent) ||
(op->common.parent->common.aml_opcode == AML_SCOPE_OP)) {
/* No parent, the return value cannot possibly be used */
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "At Method level, result of [%s] not used\n",
acpi_ps_get_opcode_name (op->common.aml_opcode)));
return_VALUE (FALSE);
}
/* Get info on the parent. The root_op is AML_SCOPE */
parent_info = acpi_ps_get_opcode_info (op->common.parent->common.aml_opcode);
if (parent_info->class == AML_CLASS_UNKNOWN) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown parent opcode. Op=%p\n", op));
return_VALUE (FALSE);
}
/*
* Decide what to do with the result based on the parent. If
* the parent opcode will not use the result, delete the object.
* Otherwise leave it as is, it will be deleted when it is used
* as an operand later.
*/
switch (parent_info->class) {
case AML_CLASS_CONTROL:
switch (op->common.parent->common.aml_opcode) {
case AML_RETURN_OP:
/* Never delete the return value associated with a return opcode */
goto result_used;
case AML_IF_OP:
case AML_WHILE_OP:
/*
* If we are executing the predicate AND this is the predicate op,
* we will use the return value
*/
if ((walk_state->control_state->common.state == ACPI_CONTROL_PREDICATE_EXECUTING) &&
(walk_state->control_state->control.predicate_op == op)) {
goto result_used;
}
break;
default:
/* Ignore other control opcodes */
break;
}
/* The general control opcode returns no result */
goto result_not_used;
case AML_CLASS_CREATE:
/*
* These opcodes allow term_arg(s) as operands and therefore
* the operands can be method calls. The result is used.
*/
goto result_used;
case AML_CLASS_NAMED_OBJECT:
if ((op->common.parent->common.aml_opcode == AML_REGION_OP) ||
(op->common.parent->common.aml_opcode == AML_DATA_REGION_OP) ||
(op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
(op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP) ||
(op->common.parent->common.aml_opcode == AML_BUFFER_OP) ||
(op->common.parent->common.aml_opcode == AML_INT_EVAL_SUBTREE_OP)) {
/*
* These opcodes allow term_arg(s) as operands and therefore
* the operands can be method calls. The result is used.
*/
goto result_used;
}
goto result_not_used;
default:
/*
* In all other cases. the parent will actually use the return
* object, so keep it.
*/
goto result_used;
}
result_used:
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Result of [%s] used by Parent [%s] Op=%p\n",
acpi_ps_get_opcode_name (op->common.aml_opcode),
acpi_ps_get_opcode_name (op->common.parent->common.aml_opcode), op));
return_VALUE (TRUE);
result_not_used:
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Result of [%s] not used by Parent [%s] Op=%p\n",
acpi_ps_get_opcode_name (op->common.aml_opcode),
acpi_ps_get_opcode_name (op->common.parent->common.aml_opcode), op));
return_VALUE (FALSE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_delete_result_if_not_used
*
* PARAMETERS: Op - Current parse Op
* result_obj - Result of the operation
* walk_state - Current state
*
* RETURN: Status
*
* DESCRIPTION: Used after interpretation of an opcode. If there is an internal
* result descriptor, check if the parent opcode will actually use
* this result. If not, delete the result now so that it will
* not become orphaned.
*
******************************************************************************/
void
acpi_ds_delete_result_if_not_used (
union acpi_parse_object *op,
union acpi_operand_object *result_obj,
struct acpi_walk_state *walk_state)
{
union acpi_operand_object *obj_desc;
acpi_status status;
ACPI_FUNCTION_TRACE_PTR ("ds_delete_result_if_not_used", result_obj);
if (!op) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null Op\n"));
return_VOID;
}
if (!result_obj) {
return_VOID;
}
if (!acpi_ds_is_result_used (op, walk_state)) {
/* Must pop the result stack (obj_desc should be equal to result_obj) */
status = acpi_ds_result_pop (&obj_desc, walk_state);
if (ACPI_SUCCESS (status)) {
acpi_ut_remove_reference (result_obj);
}
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_resolve_operands
*
* PARAMETERS: walk_state - Current walk state with operands on stack
*
* RETURN: Status
*
* DESCRIPTION: Resolve all operands to their values. Used to prepare
* arguments to a control method invocation (a call from one
* method to another.)
*
******************************************************************************/
acpi_status
acpi_ds_resolve_operands (
struct acpi_walk_state *walk_state)
{
u32 i;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE_PTR ("ds_resolve_operands", walk_state);
/*
* Attempt to resolve each of the valid operands
* Method arguments are passed by reference, not by value. This means
* that the actual objects are passed, not copies of the objects.
*/
for (i = 0; i < walk_state->num_operands; i++) {
status = acpi_ex_resolve_to_value (&walk_state->operands[i], walk_state);
if (ACPI_FAILURE (status)) {
break;
}
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_clear_operands
*
* PARAMETERS: walk_state - Current walk state with operands on stack
*
* RETURN: None
*
* DESCRIPTION: Clear all operands on the current walk state operand stack.
*
******************************************************************************/
void
acpi_ds_clear_operands (
struct acpi_walk_state *walk_state)
{
u32 i;
ACPI_FUNCTION_TRACE_PTR ("ds_clear_operands", walk_state);
/* Remove a reference on each operand on the stack */
for (i = 0; i < walk_state->num_operands; i++) {
/*
* Remove a reference to all operands, including both
* "Arguments" and "Targets".
*/
acpi_ut_remove_reference (walk_state->operands[i]);
walk_state->operands[i] = NULL;
}
walk_state->num_operands = 0;
return_VOID;
}
#endif
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_operand
*
* PARAMETERS: walk_state - Current walk state
* Arg - Parse object for the argument
* arg_index - Which argument (zero based)
*
* RETURN: Status
*
* DESCRIPTION: Translate a parse tree object that is an argument to an AML
* opcode to the equivalent interpreter object. This may include
* looking up a name or entering a new name into the internal
* namespace.
*
******************************************************************************/
acpi_status
acpi_ds_create_operand (
struct acpi_walk_state *walk_state,
union acpi_parse_object *arg,
u32 arg_index)
{
acpi_status status = AE_OK;
char *name_string;
u32 name_length;
union acpi_operand_object *obj_desc;
union acpi_parse_object *parent_op;
u16 opcode;
acpi_interpreter_mode interpreter_mode;
const struct acpi_opcode_info *op_info;
ACPI_FUNCTION_TRACE_PTR ("ds_create_operand", arg);
/* A valid name must be looked up in the namespace */
if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
(arg->common.value.string)) {
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", arg));
/* Get the entire name string from the AML stream */
status = acpi_ex_get_name_string (ACPI_TYPE_ANY, arg->common.value.buffer,
&name_string, &name_length);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* All prefixes have been handled, and the name is in name_string */
/*
* Special handling for buffer_field declarations. This is a deferred
* opcode that unfortunately defines the field name as the last
* parameter instead of the first. We get here when we are performing
* the deferred execution, so the actual name of the field is already
* in the namespace. We don't want to attempt to look it up again
* because we may be executing in a different scope than where the
* actual opcode exists.
*/
if ((walk_state->deferred_node) &&
(walk_state->deferred_node->type == ACPI_TYPE_BUFFER_FIELD) &&
(arg_index != 0)) {
obj_desc = ACPI_CAST_PTR (union acpi_operand_object, walk_state->deferred_node);
status = AE_OK;
}
else /* All other opcodes */ {
/*
* Differentiate between a namespace "create" operation
* versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
* IMODE_EXECUTE) in order to support the creation of
* namespace objects during the execution of control methods.
*/
parent_op = arg->common.parent;
op_info = acpi_ps_get_opcode_info (parent_op->common.aml_opcode);
if ((op_info->flags & AML_NSNODE) &&
(parent_op->common.aml_opcode != AML_INT_METHODCALL_OP) &&
(parent_op->common.aml_opcode != AML_REGION_OP) &&
(parent_op->common.aml_opcode != AML_INT_NAMEPATH_OP)) {
/* Enter name into namespace if not found */
interpreter_mode = ACPI_IMODE_LOAD_PASS2;
}
else {
/* Return a failure if name not found */
interpreter_mode = ACPI_IMODE_EXECUTE;
}
status = acpi_ns_lookup (walk_state->scope_info, name_string,
ACPI_TYPE_ANY, interpreter_mode,
ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
walk_state,
ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &obj_desc));
/*
* The only case where we pass through (ignore) a NOT_FOUND
* error is for the cond_ref_of opcode.
*/
if (status == AE_NOT_FOUND) {
if (parent_op->common.aml_opcode == AML_COND_REF_OF_OP) {
/*
* For the Conditional Reference op, it's OK if
* the name is not found; We just need a way to
* indicate this to the interpreter, set the
* object to the root
*/
obj_desc = ACPI_CAST_PTR (union acpi_operand_object, acpi_gbl_root_node);
status = AE_OK;
}
else {
/*
* We just plain didn't find it -- which is a
* very serious error at this point
*/
status = AE_AML_NAME_NOT_FOUND;
}
}
if (ACPI_FAILURE (status)) {
ACPI_REPORT_NSERROR (name_string, status);
}
}
/* Free the namestring created above */
ACPI_MEM_FREE (name_string);
/* Check status from the lookup */
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* Put the resulting object onto the current object stack */
status = acpi_ds_obj_stack_push (obj_desc, walk_state);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
ACPI_DEBUGGER_EXEC (acpi_db_display_argument_object (obj_desc, walk_state));
}
else {
/* Check for null name case */
if (arg->common.aml_opcode == AML_INT_NAMEPATH_OP) {
/*
* If the name is null, this means that this is an
* optional result parameter that was not specified
* in the original ASL. Create a Zero Constant for a
* placeholder. (Store to a constant is a Noop.)
*/
opcode = AML_ZERO_OP; /* Has no arguments! */
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Null namepath: Arg=%p\n", arg));
}
else {
opcode = arg->common.aml_opcode;
}
/* Get the object type of the argument */
op_info = acpi_ps_get_opcode_info (opcode);
if (op_info->object_type == ACPI_TYPE_INVALID) {
return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
}
if (op_info->flags & AML_HAS_RETVAL) {
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
"Argument previously created, already stacked \n"));
ACPI_DEBUGGER_EXEC (acpi_db_display_argument_object (
walk_state->operands [walk_state->num_operands - 1], walk_state));
/*
* Use value that was already previously returned
* by the evaluation of this argument
*/
status = acpi_ds_result_pop_from_bottom (&obj_desc, walk_state);
if (ACPI_FAILURE (status)) {
/*
* Only error is underflow, and this indicates
* a missing or null operand!
*/
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Missing or null operand, %s\n",
acpi_format_exception (status)));
return_ACPI_STATUS (status);
}
}
else {
/* Create an ACPI_INTERNAL_OBJECT for the argument */
obj_desc = acpi_ut_create_internal_object (op_info->object_type);
if (!obj_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Initialize the new object */
status = acpi_ds_init_object_from_op (walk_state, arg,
opcode, &obj_desc);
if (ACPI_FAILURE (status)) {
acpi_ut_delete_object_desc (obj_desc);
return_ACPI_STATUS (status);
}
}
/* Put the operand object on the object stack */
status = acpi_ds_obj_stack_push (obj_desc, walk_state);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
ACPI_DEBUGGER_EXEC (acpi_db_display_argument_object (obj_desc, walk_state));
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_operands
*
* PARAMETERS: walk_state - Current state
* first_arg - First argument of a parser argument tree
*
* RETURN: Status
*
* DESCRIPTION: Convert an operator's arguments from a parse tree format to
* namespace objects and place those argument object on the object
* stack in preparation for evaluation by the interpreter.
*
******************************************************************************/
acpi_status
acpi_ds_create_operands (
struct acpi_walk_state *walk_state,
union acpi_parse_object *first_arg)
{
acpi_status status = AE_OK;
union acpi_parse_object *arg;
u32 arg_count = 0;
ACPI_FUNCTION_TRACE_PTR ("ds_create_operands", first_arg);
/* For all arguments in the list... */
arg = first_arg;
while (arg) {
status = acpi_ds_create_operand (walk_state, arg, arg_count);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Arg #%d (%p) done, Arg1=%p\n",
arg_count, arg, first_arg));
/* Move on to next argument, if any */
arg = arg->common.next;
arg_count++;
}
return_ACPI_STATUS (status);
cleanup:
/*
* We must undo everything done above; meaning that we must
* pop everything off of the operand stack and delete those
* objects
*/
(void) acpi_ds_obj_stack_pop_and_delete (arg_count, walk_state);
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "While creating Arg %d - %s\n",
(arg_count + 1), acpi_format_exception (status)));
return_ACPI_STATUS (status);
}
