[linux-2.6-block.git] / drivers / acpi / acpica / dscontrol.c

/******************************************************************************
 *
 * Module Name: dscontrol - Support for execution control opcodes -
 *                          if/else/while/return
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, Intel Corp.
 * 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 "accommon.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acdebug.h"

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dscontrol")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_exec_begin_control_op
 *
 * PARAMETERS:  walk_list       - The list that owns the walk stack
 *              op              - The control Op
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handles all control ops encountered during control method
 *              execution.
 *
 ******************************************************************************/
acpi_status
acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
			      union acpi_parse_object *op)
{
	acpi_status status = AE_OK;
	union acpi_generic_state *control_state;

	ACPI_FUNCTION_NAME(ds_exec_begin_control_op);

	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n",
			  op, op->common.aml_opcode, walk_state));

	switch (op->common.aml_opcode) {
	case AML_WHILE_OP:
		/*
		 * If this is an additional iteration of a while loop, continue.
		 * There is no need to allocate a new control state.
		 */
		if (walk_state->control_state) {
			if (walk_state->control_state->control.
			    aml_predicate_start ==
			    (walk_state->parser_state.aml - 1)) {

				/* Reset the state to start-of-loop */

				walk_state->control_state->common.state =
				    ACPI_CONTROL_CONDITIONAL_EXECUTING;
				break;
			}
		}

		/*lint -fallthrough */

	case AML_IF_OP:
		/*
		 * IF/WHILE: Create a new control state to manage these
		 * constructs. We need to manage these as a stack, in order
		 * to handle nesting.
		 */
		control_state = acpi_ut_create_control_state();
		if (!control_state) {
			status = AE_NO_MEMORY;
			break;
		}
		/*
		 * Save a pointer to the predicate for multiple executions
		 * of a loop
		 */
		control_state->control.aml_predicate_start =
		    walk_state->parser_state.aml - 1;
		control_state->control.package_end =
		    walk_state->parser_state.pkg_end;
		control_state->control.opcode = op->common.aml_opcode;
		control_state->control.loop_timeout = acpi_os_get_timer() +
		    (u64)(acpi_gbl_max_loop_iterations * ACPI_100NSEC_PER_SEC);

		/* Push the control state on this walk's control stack */

		acpi_ut_push_generic_state(&walk_state->control_state,
					   control_state);
		break;

	case AML_ELSE_OP:

		/* Predicate is in the state object */
		/* If predicate is true, the IF was executed, ignore ELSE part */

		if (walk_state->last_predicate) {
			status = AE_CTRL_TRUE;
		}

		break;

	case AML_RETURN_OP:

		break;

	default:

		break;
	}

	return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_exec_end_control_op
 *
 * PARAMETERS:  walk_list       - The list that owns the walk stack
 *              op              - The control Op
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handles all control ops encountered during control method
 *              execution.
 *
 ******************************************************************************/

acpi_status
acpi_ds_exec_end_control_op(struct acpi_walk_state *walk_state,
			    union acpi_parse_object *op)
{
	acpi_status status = AE_OK;
	union acpi_generic_state *control_state;

	ACPI_FUNCTION_NAME(ds_exec_end_control_op);

	switch (op->common.aml_opcode) {
	case AML_IF_OP:

		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));

		/*
		 * Save the result of the predicate in case there is an
		 * ELSE to come
		 */
		walk_state->last_predicate =
		    (u8)walk_state->control_state->common.value;

		/*
		 * Pop the control state that was created at the start
		 * of the IF and free it
		 */
		control_state =
		    acpi_ut_pop_generic_state(&walk_state->control_state);
		acpi_ut_delete_generic_state(control_state);
		break;

	case AML_ELSE_OP:

		break;

	case AML_WHILE_OP:

		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));

		control_state = walk_state->control_state;
		if (control_state->common.value) {

			/* Predicate was true, the body of the loop was just executed */

			/*
			 * This infinite loop detection mechanism allows the interpreter
			 * to escape possibly infinite loops. This can occur in poorly
			 * written AML when the hardware does not respond within a while
			 * loop and the loop does not implement a timeout.
			 */
			if (ACPI_TIME_AFTER(acpi_os_get_timer(),
					    control_state->control.
					    loop_timeout)) {
				status = AE_AML_LOOP_TIMEOUT;
				break;
			}

			/*
			 * Go back and evaluate the predicate and maybe execute the loop
			 * another time
			 */
			status = AE_CTRL_PENDING;
			walk_state->aml_last_while =
			    control_state->control.aml_predicate_start;
			break;
		}

		/* Predicate was false, terminate this while loop */

		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "[WHILE_OP] termination! Op=%p\n", op));

		/* Pop this control state and free it */

		control_state =
		    acpi_ut_pop_generic_state(&walk_state->control_state);
		acpi_ut_delete_generic_state(control_state);
		break;

	case AML_RETURN_OP:

		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "[RETURN_OP] Op=%p Arg=%p\n", op,
				  op->common.value.arg));

		/*
		 * One optional operand -- the return value
		 * It can be either an immediate operand or a result that
		 * has been bubbled up the tree
		 */
		if (op->common.value.arg) {

			/* Since we have a real Return(), delete any implicit return */

			acpi_ds_clear_implicit_return(walk_state);

			/* Return statement has an immediate operand */

			status =
			    acpi_ds_create_operands(walk_state,
						    op->common.value.arg);
			if (ACPI_FAILURE(status)) {
				return (status);
			}

			/*
			 * If value being returned is a Reference (such as
			 * an arg or local), resolve it now because it may
			 * cease to exist at the end of the method.
			 */
			status =
			    acpi_ex_resolve_to_value(&walk_state->operands[0],
						     walk_state);
			if (ACPI_FAILURE(status)) {
				return (status);
			}

			/*
			 * Get the return value and save as the last result
			 * value. This is the only place where walk_state->return_desc
			 * is set to anything other than zero!
			 */
			walk_state->return_desc = walk_state->operands[0];
		} else if (walk_state->result_count) {

			/* Since we have a real Return(), delete any implicit return */

			acpi_ds_clear_implicit_return(walk_state);

			/*
			 * The return value has come from a previous calculation.
			 *
			 * If value being returned is a Reference (such as
			 * an arg or local), resolve it now because it may
			 * cease to exist at the end of the method.
			 *
			 * Allow references created by the Index operator to return
			 * unchanged.
			 */
			if ((ACPI_GET_DESCRIPTOR_TYPE
			     (walk_state->results->results.obj_desc[0]) ==
			     ACPI_DESC_TYPE_OPERAND)
			    && ((walk_state->results->results.obj_desc[0])->
				common.type == ACPI_TYPE_LOCAL_REFERENCE)
			    && ((walk_state->results->results.obj_desc[0])->
				reference.class != ACPI_REFCLASS_INDEX)) {
				status =
				    acpi_ex_resolve_to_value(&walk_state->
							     results->results.
							     obj_desc[0],
							     walk_state);
				if (ACPI_FAILURE(status)) {
					return (status);
				}
			}

			walk_state->return_desc =
			    walk_state->results->results.obj_desc[0];
		} else {
			/* No return operand */

			if (walk_state->num_operands) {
				acpi_ut_remove_reference(walk_state->
							 operands[0]);
			}

			walk_state->operands[0] = NULL;
			walk_state->num_operands = 0;
			walk_state->return_desc = NULL;
		}

		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
				  "Completed RETURN_OP State=%p, RetVal=%p\n",
				  walk_state, walk_state->return_desc));

		/* End the control method execution right now */

		status = AE_CTRL_TERMINATE;
		break;

	case AML_NOOP_OP:

		/* Just do nothing! */

		break;

	case AML_BREAKPOINT_OP:

		acpi_db_signal_break_point(walk_state);

		/* Call to the OSL in case OS wants a piece of the action */

		status = acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
					"Executed AML Breakpoint opcode");
		break;

	case AML_BREAK_OP:
	case AML_CONTINUE_OP:	/* ACPI 2.0 */

		/* Pop and delete control states until we find a while */

		while (walk_state->control_state &&
		       (walk_state->control_state->control.opcode !=
			AML_WHILE_OP)) {
			control_state =
			    acpi_ut_pop_generic_state(&walk_state->
						      control_state);
			acpi_ut_delete_generic_state(control_state);
		}

		/* No while found? */

		if (!walk_state->control_state) {
			return (AE_AML_NO_WHILE);
		}

		/* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */

		walk_state->aml_last_while =
		    walk_state->control_state->control.package_end;

		/* Return status depending on opcode */

		if (op->common.aml_opcode == AML_BREAK_OP) {
			status = AE_CTRL_BREAK;
		} else {
			status = AE_CTRL_CONTINUE;
		}
		break;

	default:

		ACPI_ERROR((AE_INFO, "Unknown control opcode=0x%X Op=%p",
			    op->common.aml_opcode, op));

		status = AE_AML_BAD_OPCODE;
		break;
	}

	return (status);
}
Commit	Line	Data
9ad19ac4 BM	1	/******************************************************************************
	2	*
	3	* Module Name: dscontrol - Support for execution control opcodes -
	4	* if/else/while/return
	5	*
	6	*****************************************************************************/
	7
	8	/*
7735ca0e	9	* Copyright (C) 2000 - 2017, Intel Corp.
9ad19ac4 BM	10	* All rights reserved.
	11	*
	12	* Redistribution and use in source and binary forms, with or without
	13	* modification, are permitted provided that the following conditions
	14	* are met:
	15	* 1. Redistributions of source code must retain the above copyright
	16	* notice, this list of conditions, and the following disclaimer,
	17	* without modification.
	18	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	19	* substantially similar to the "NO WARRANTY" disclaimer below
	20	* ("Disclaimer") and any redistribution must be conditioned upon
	21	* including a substantially similar Disclaimer requirement for further
	22	* binary redistribution.
	23	* 3. Neither the names of the above-listed copyright holders nor the names
	24	* of any contributors may be used to endorse or promote products derived
	25	* from this software without specific prior written permission.
	26	*
	27	* Alternatively, this software may be distributed under the terms of the
	28	* GNU General Public License ("GPL") version 2 as published by the Free
	29	* Software Foundation.
	30	*
	31	* NO WARRANTY
	32	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	33	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	34	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	35	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	36	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	37	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	38	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	39	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	40	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	41	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	42	* POSSIBILITY OF SUCH DAMAGES.
	43	*/
	44
	45	#include <acpi/acpi.h>
	46	#include "accommon.h"
	47	#include "amlcode.h"
	48	#include "acdispat.h"
	49	#include "acinterp.h"
8a2a2501	50	#include "acdebug.h"
9ad19ac4 BM	51
	52	#define _COMPONENT ACPI_DISPATCHER
	53	ACPI_MODULE_NAME("dscontrol")
	54
	55	/*******************************************************************************
	56	*
	57	* FUNCTION: acpi_ds_exec_begin_control_op
	58	*
	59	* PARAMETERS: walk_list - The list that owns the walk stack
ba494bee	60	* op - The control Op
9ad19ac4 BM	61	*
	62	* RETURN: Status
	63	*
	64	* DESCRIPTION: Handles all control ops encountered during control method
	65	* execution.
	66	*
	67	******************************************************************************/
	68	acpi_status
	69	acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
	70	union acpi_parse_object *op)
	71	{
	72	acpi_status status = AE_OK;
	73	union acpi_generic_state *control_state;
	74
	75	ACPI_FUNCTION_NAME(ds_exec_begin_control_op);
	76
	77	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n",
	78	op, op->common.aml_opcode, walk_state));
	79
	80	switch (op->common.aml_opcode) {
	81	case AML_WHILE_OP:
9ad19ac4 BM	82	/*
	83	* If this is an additional iteration of a while loop, continue.
	84	* There is no need to allocate a new control state.
	85	*/
	86	if (walk_state->control_state) {
	87	if (walk_state->control_state->control.
	88	aml_predicate_start ==
	89	(walk_state->parser_state.aml - 1)) {
	90
	91	/* Reset the state to start-of-loop */
	92
	93	walk_state->control_state->common.state =
	94	ACPI_CONTROL_CONDITIONAL_EXECUTING;
	95	break;
	96	}
	97	}
	98
	99	/lint -fallthrough /
	100
	101	case AML_IF_OP:
9ad19ac4 BM	102	/*
	103	* IF/WHILE: Create a new control state to manage these
	104	* constructs. We need to manage these as a stack, in order
	105	* to handle nesting.
	106	*/
	107	control_state = acpi_ut_create_control_state();
	108	if (!control_state) {
	109	status = AE_NO_MEMORY;
	110	break;
	111	}
	112	/*
	113	* Save a pointer to the predicate for multiple executions
	114	* of a loop
	115	*/
	116	control_state->control.aml_predicate_start =
	117	walk_state->parser_state.aml - 1;
	118	control_state->control.package_end =
	119	walk_state->parser_state.pkg_end;
	120	control_state->control.opcode = op->common.aml_opcode;
164a08ce LZ	121	control_state->control.loop_timeout = acpi_os_get_timer() +
164a08ce LZ	122	(u64)(acpi_gbl_max_loop_iterations * ACPI_100NSEC_PER_SEC);
9ad19ac4 BM	123
	124	/* Push the control state on this walk's control stack */
	125
	126	acpi_ut_push_generic_state(&walk_state->control_state,
	127	control_state);
	128	break;
	129
	130	case AML_ELSE_OP:
	131
	132	/* Predicate is in the state object */
	133	/* If predicate is true, the IF was executed, ignore ELSE part */
	134
	135	if (walk_state->last_predicate) {
	136	status = AE_CTRL_TRUE;
	137	}
	138
	139	break;
	140
	141	case AML_RETURN_OP:
	142
	143	break;
	144
	145	default:
1d1ea1b7	146
9ad19ac4 BM	147	break;
	148	}
	149
	150	return (status);
	151	}
	152
	153	/*******************************************************************************
	154	*
	155	* FUNCTION: acpi_ds_exec_end_control_op
	156	*
	157	* PARAMETERS: walk_list - The list that owns the walk stack
ba494bee	158	* op - The control Op
9ad19ac4 BM	159	*
	160	* RETURN: Status
	161	*
	162	* DESCRIPTION: Handles all control ops encountered during control method
	163	* execution.
	164	*
	165	******************************************************************************/
	166
	167	acpi_status
f5c1e1c5 LZ	168	acpi_ds_exec_end_control_op(struct acpi_walk_state *walk_state,
f5c1e1c5 LZ	169	union acpi_parse_object *op)
9ad19ac4 BM	170	{
	171	acpi_status status = AE_OK;
	172	union acpi_generic_state *control_state;
	173
	174	ACPI_FUNCTION_NAME(ds_exec_end_control_op);
	175
	176	switch (op->common.aml_opcode) {
	177	case AML_IF_OP:
	178
	179	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
	180
	181	/*
	182	* Save the result of the predicate in case there is an
	183	* ELSE to come
	184	*/
	185	walk_state->last_predicate =
	186	(u8)walk_state->control_state->common.value;
	187
	188	/*
	189	* Pop the control state that was created at the start
	190	* of the IF and free it
	191	*/
	192	control_state =
	193	acpi_ut_pop_generic_state(&walk_state->control_state);
	194	acpi_ut_delete_generic_state(control_state);
	195	break;
	196
	197	case AML_ELSE_OP:
	198
	199	break;
	200
	201	case AML_WHILE_OP:
	202
	203	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
	204
	205	control_state = walk_state->control_state;
	206	if (control_state->common.value) {
	207
	208	/* Predicate was true, the body of the loop was just executed */
	209
	210	/*
164a08ce LZ	211	* This infinite loop detection mechanism allows the interpreter
	212	* to escape possibly infinite loops. This can occur in poorly
	213	* written AML when the hardware does not respond within a while
	214	* loop and the loop does not implement a timeout.
9ad19ac4	215	*/
164a08ce LZ	216	if (ACPI_TIME_AFTER(acpi_os_get_timer(),
	217	control_state->control.
	218	loop_timeout)) {
a26f4df9	219	status = AE_AML_LOOP_TIMEOUT;
9ad19ac4 BM	220	break;
	221	}
	222
	223	/*
	224	* Go back and evaluate the predicate and maybe execute the loop
	225	* another time
	226	*/
	227	status = AE_CTRL_PENDING;
	228	walk_state->aml_last_while =
	229	control_state->control.aml_predicate_start;
	230	break;
	231	}
	232
	233	/* Predicate was false, terminate this while loop */
	234
	235	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
	236	"[WHILE_OP] termination! Op=%p\n", op));
	237
	238	/* Pop this control state and free it */
	239
	240	control_state =
	241	acpi_ut_pop_generic_state(&walk_state->control_state);
	242	acpi_ut_delete_generic_state(control_state);
	243	break;
	244
	245	case AML_RETURN_OP:
	246
	247	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
	248	"[RETURN_OP] Op=%p Arg=%p\n", op,
	249	op->common.value.arg));
	250
	251	/*
	252	* One optional operand -- the return value
	253	* It can be either an immediate operand or a result that
	254	* has been bubbled up the tree
	255	*/
	256	if (op->common.value.arg) {
	257
	258	/* Since we have a real Return(), delete any implicit return */
	259
	260	acpi_ds_clear_implicit_return(walk_state);
	261
	262	/* Return statement has an immediate operand */
	263
	264	status =
	265	acpi_ds_create_operands(walk_state,
	266	op->common.value.arg);
	267	if (ACPI_FAILURE(status)) {
	268	return (status);
	269	}
	270
	271	/*
	272	* If value being returned is a Reference (such as
	273	* an arg or local), resolve it now because it may
	274	* cease to exist at the end of the method.
	275	*/
	276	status =
	277	acpi_ex_resolve_to_value(&walk_state->operands[0],
	278	walk_state);
	279	if (ACPI_FAILURE(status)) {
	280	return (status);
	281	}
	282
	283	/*
284	* Get the return value and save as the last result
73a3090a	285	* value. This is the only place where walk_state->return_desc
9ad19ac4 BM	286	* is set to anything other than zero!
	287	*/
	288	walk_state->return_desc = walk_state->operands[0];
	289	} else if (walk_state->result_count) {
	290
	291	/* Since we have a real Return(), delete any implicit return */
	292
	293	acpi_ds_clear_implicit_return(walk_state);
	294
	295	/*
	296	* The return value has come from a previous calculation.
	297	*
	298	* If value being returned is a Reference (such as
	299	* an arg or local), resolve it now because it may
	300	* cease to exist at the end of the method.
	301	*
	302	* Allow references created by the Index operator to return
	303	* unchanged.
	304	*/
	305	if ((ACPI_GET_DESCRIPTOR_TYPE
	306	(walk_state->results->results.obj_desc[0]) ==
	307	ACPI_DESC_TYPE_OPERAND)
	308	&& ((walk_state->results->results.obj_desc[0])->
	309	common.type == ACPI_TYPE_LOCAL_REFERENCE)
	310	&& ((walk_state->results->results.obj_desc[0])->
	311	reference.class != ACPI_REFCLASS_INDEX)) {
	312	status =
	313	acpi_ex_resolve_to_value(&walk_state->
	314	results->results.
	315	obj_desc[0],
	316	walk_state);
	317	if (ACPI_FAILURE(status)) {
	318	return (status);
	319	}
	320	}
	321
	322	walk_state->return_desc =
	323	walk_state->results->results.obj_desc[0];
	324	} else {
	325	/* No return operand */
	326
	327	if (walk_state->num_operands) {
	328	acpi_ut_remove_reference(walk_state->
	329	operands[0]);
	330	}
	331
	332	walk_state->operands[0] = NULL;
	333	walk_state->num_operands = 0;
	334	walk_state->return_desc = NULL;
	335	}
	336
	337	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
	338	"Completed RETURN_OP State=%p, RetVal=%p\n",
	339	walk_state, walk_state->return_desc));
	340
	341	/* End the control method execution right now */
	342
	343	status = AE_CTRL_TERMINATE;
	344	break;
	345
	346	case AML_NOOP_OP:
	347
	348	/* Just do nothing! */
1d1ea1b7	349
9ad19ac4 BM	350	break;
9ad19ac4 BM	351
9ff5a21a	352	case AML_BREAKPOINT_OP:
9ad19ac4	353
8a2a2501	354	acpi_db_signal_break_point(walk_state);
9ad19ac4 BM	355
	356	/* Call to the OSL in case OS wants a piece of the action */
	357
	358	status = acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
	359	"Executed AML Breakpoint opcode");
	360	break;
	361
	362	case AML_BREAK_OP:
	363	case AML_CONTINUE_OP: /* ACPI 2.0 */
	364
	365	/* Pop and delete control states until we find a while */
	366
	367	while (walk_state->control_state &&
	368	(walk_state->control_state->control.opcode !=
	369	AML_WHILE_OP)) {
	370	control_state =
	371	acpi_ut_pop_generic_state(&walk_state->
	372	control_state);
	373	acpi_ut_delete_generic_state(control_state);
	374	}
	375
	376	/* No while found? */
	377
	378	if (!walk_state->control_state) {
	379	return (AE_AML_NO_WHILE);
	380	}
	381
	382	/* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
	383
	384	walk_state->aml_last_while =
	385	walk_state->control_state->control.package_end;
	386
	387	/* Return status depending on opcode */
	388
	389	if (op->common.aml_opcode == AML_BREAK_OP) {
	390	status = AE_CTRL_BREAK;
	391	} else {
	392	status = AE_CTRL_CONTINUE;
	393	}
	394	break;
	395
	396	default:
	397
	398	ACPI_ERROR((AE_INFO, "Unknown control opcode=0x%X Op=%p",
	399	op->common.aml_opcode, op));
	400
	401	status = AE_AML_BAD_OPCODE;
	402	break;
	403	}
	404
	405	return (status);
	406	}