dswexec.c

linux-2.6.15.6

/******************************************************************************
 *
 * Module Name: dswexec - Dispatcher method execution callbacks;
 *                        dispatch to interpreter.
 *
 *****************************************************************************/

/*
 * 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>
#include <acpi/acdisasm.h>

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dswexec")

/*
 * Dispatch table for opcode classes
 */
static ACPI_EXECUTE_OP acpi_gbl_op_type_dispatch[] = {
	acpi_ex_opcode_0A_0T_1R,
	acpi_ex_opcode_1A_0T_0R,
	acpi_ex_opcode_1A_0T_1R,
	acpi_ex_opcode_1A_1T_0R,
	acpi_ex_opcode_1A_1T_1R,
	acpi_ex_opcode_2A_0T_0R,
	acpi_ex_opcode_2A_0T_1R,
	acpi_ex_opcode_2A_1T_1R,
	acpi_ex_opcode_2A_2T_1R,
	acpi_ex_opcode_3A_0T_0R,
	acpi_ex_opcode_3A_1T_1R,
	acpi_ex_opcode_6A_0T_1R
};

/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_get_predicate_value
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              result_obj      - if non-zero, pop result from result stack
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the result of a predicate evaluation
 *
 ****************************************************************************/

acpi_status
acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
			    union acpi_operand_object *result_obj)
{
	acpi_status status = AE_OK;
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *local_obj_desc = NULL;

	ACPI_FUNCTION_TRACE_PTR("ds_get_predicate_value", walk_state);

	walk_state->control_state->common.state = 0;

	if (result_obj) {
		status = acpi_ds_result_pop(&obj_desc, walk_state);
		if (ACPI_FAILURE(status)) {
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
					  "Could not get result from predicate evaluation, %s\n",
					  acpi_format_exception(status)));

			return_ACPI_STATUS(status);
		}
	} else {
		status = acpi_ds_create_operand(walk_state, walk_state->op, 0);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		status =
		    acpi_ex_resolve_to_value(&walk_state->operands[0],
					     walk_state);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		obj_desc = walk_state->operands[0];
	}

	if (!obj_desc) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "No predicate obj_desc=%p State=%p\n",
				  obj_desc, walk_state));

		return_ACPI_STATUS(AE_AML_NO_OPERAND);
	}

	/*
	 * Result of predicate evaluation must be an Integer
	 * object. Implicitly convert the argument if necessary.
	 */
	status = acpi_ex_convert_to_integer(obj_desc, &local_obj_desc, 16);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	if (ACPI_GET_OBJECT_TYPE(local_obj_desc) != ACPI_TYPE_INTEGER) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Bad predicate (not an integer) obj_desc=%p State=%p Type=%X\n",
				  obj_desc, walk_state,
				  ACPI_GET_OBJECT_TYPE(obj_desc)));

		status = AE_AML_OPERAND_TYPE;
		goto cleanup;
	}

	/* Truncate the predicate to 32-bits if necessary */

	acpi_ex_truncate_for32bit_table(local_obj_desc);

	/*
	 * Save the result of the predicate evaluation on
	 * the control stack
	 */
	if (local_obj_desc->integer.value) {
		walk_state->control_state->common.value = TRUE;
	} else {
		/*
		 * Predicate is FALSE, we will just toss the
		 * rest of the package
		 */
		walk_state->control_state->common.value = FALSE;
		status = AE_CTRL_FALSE;
	}

      cleanup:

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%p\n",
			  walk_state->control_state->common.value,
			  walk_state->op));

	/* Break to debugger to display result */

	ACPI_DEBUGGER_EXEC(acpi_db_display_result_object
			   (local_obj_desc, walk_state));

	/*
	 * Delete the predicate result object (we know that
	 * we don't need it anymore)
	 */
	if (local_obj_desc != obj_desc) {
		acpi_ut_remove_reference(local_obj_desc);
	}
	acpi_ut_remove_reference(obj_desc);

	walk_state->control_state->common.state = ACPI_CONTROL_NORMAL;
	return_ACPI_STATUS(status);
}

/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_exec_begin_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *              out_op          - Where to return op if a new one is created
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Descending callback used during the execution of control
 *              methods.  This is where most operators and operands are
 *              dispatched to the interpreter.
 *
 ****************************************************************************/

acpi_status
acpi_ds_exec_begin_op(struct acpi_walk_state *walk_state,
		      union acpi_parse_object **out_op)
{
	union acpi_parse_object *op;
	acpi_status status = AE_OK;
	u32 opcode_class;

	ACPI_FUNCTION_TRACE_PTR("ds_exec_begin_op", walk_state);

	op = walk_state->op;
	if (!op) {
		status = acpi_ds_load2_begin_op(walk_state, out_op);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		op = *out_op;
		walk_state->op = op;
		walk_state->opcode = op->common.aml_opcode;
		walk_state->op_info =
		    acpi_ps_get_opcode_info(op->common.aml_opcode);

		if (acpi_ns_opens_scope(walk_state->op_info->object_type)) {
			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
					  "(%s) Popping scope for Op %p\n",
					  acpi_ut_get_type_name(walk_state->
								op_info->
								object_type),
					  op));

			status = acpi_ds_scope_stack_pop(walk_state);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}
	}

	if (op == walk_state->origin) {
		if (out_op) {
			*out_op = op;
		}

		return_ACPI_STATUS(AE_OK);
	}

	/*
	 * If the previous opcode was a conditional, this opcode
	 * must be the beginning of the associated predicate.
	 * Save this knowledge in the current scope descriptor
	 */
	if ((walk_state->control_state) &&
	    (walk_state->control_state->common.state ==
	     ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "Exec predicate Op=%p State=%p\n", op,
				  walk_state));

		walk_state->control_state->common.state =
		    ACPI_CONTROL_PREDICATE_EXECUTING;

		/* Save start of predicate */

		walk_state->control_state->control.predicate_op = op;
	}

	opcode_class = walk_state->op_info->class;

	/* We want to send namepaths to the load code */

	if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
		opcode_class = AML_CLASS_NAMED_OBJECT;
	}

	/*
	 * Handle the opcode based upon the opcode type
	 */
	switch (opcode_class) {
	case AML_CLASS_CONTROL:

		status = acpi_ds_result_stack_push(walk_state);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		status = acpi_ds_exec_begin_control_op(walk_state, op);
		break;

	case AML_CLASS_NAMED_OBJECT:

		if (walk_state->walk_type == ACPI_WALK_METHOD) {
			/*
			 * Found a named object declaration during method execution;
			 * we must enter this object into the namespace.  The created
			 * object is temporary and will be deleted upon completion of
			 * the execution of this method.
			 */
			status = acpi_ds_load2_begin_op(walk_state, NULL);
		}

		if (op->common.aml_opcode == AML_REGION_OP) {
			status = acpi_ds_result_stack_push(walk_state);
		}
		break;

	case AML_CLASS_EXECUTE:
	case AML_CLASS_CREATE:

		/*
		 * Most operators with arguments.
		 * Start a new result/operand state
		 */
		status = acpi_ds_result_stack_push(walk_state);
		break;

	default:
		break;
	}

	/* Nothing to do here during method execution */

	return_ACPI_STATUS(status);
}

/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_exec_end_op
 *
 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Ascending callback used during the execution of control
 *              methods.  The only thing we really need to do here is to
 *              notice the beginning of IF, ELSE, and WHILE blocks.
 *
 ****************************************************************************/

acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
{
	union acpi_parse_object *op;
	acpi_status status = AE_OK;
	u32 op_type;
	u32 op_class;
	union acpi_parse_object *next_op;
	union acpi_parse_object *first_arg;

	ACPI_FUNCTION_TRACE_PTR("ds_exec_end_op", walk_state);

	op = walk_state->op;
	op_type = walk_state->op_info->type;
	op_class = walk_state->op_info->class;

	if (op_class == AML_CLASS_UNKNOWN) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown opcode %X\n",
				  op->common.aml_opcode));
		return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
	}

	first_arg = op->common.value.arg;

	/* Init the walk state */

	walk_state->num_operands = 0;
	walk_state->return_desc = NULL;
	walk_state->result_obj = NULL;

	/* Call debugger for single step support (DEBUG build only) */

	ACPI_DEBUGGER_EXEC(status =
			   acpi_db_single_step(walk_state, op, op_class));
	ACPI_DEBUGGER_EXEC(if (ACPI_FAILURE(status)) {
			   return_ACPI_STATUS(status);}
	) ;

	/* Decode the Opcode Class */

	switch (op_class) {
	case AML_CLASS_ARGUMENT:	/* constants, literals, etc. - do nothing */