[linux.git] / drivers / acpi / acpica / dscontrol.c

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

/*
 * Copyright (C) 2000 - 2016, 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;

		/* 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 loop counter 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.
			 */
			control_state->control.loop_count++;
			if (control_state->control.loop_count >
			    acpi_gbl_max_loop_iterations) {
				status = AE_AML_INFINITE_LOOP;
				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_BREAK_POINT_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	/*
c8100dc4	9	* Copyright (C) 2000 - 2016, 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;
	121
	122	/* Push the control state on this walk's control stack */
	123
	124	acpi_ut_push_generic_state(&walk_state->control_state,
	125	control_state);
	126	break;
	127
	128	case AML_ELSE_OP:
	129
	130	/* Predicate is in the state object */
	131	/* If predicate is true, the IF was executed, ignore ELSE part */
	132
	133	if (walk_state->last_predicate) {
	134	status = AE_CTRL_TRUE;
	135	}
	136
	137	break;
	138
	139	case AML_RETURN_OP:
	140
	141	break;
	142
	143	default:
1d1ea1b7	144
9ad19ac4 BM	145	break;
	146	}
	147
	148	return (status);
	149	}
	150
	151	/*******************************************************************************
	152	*
	153	* FUNCTION: acpi_ds_exec_end_control_op
	154	*
	155	* PARAMETERS: walk_list - The list that owns the walk stack
ba494bee	156	* op - The control Op
9ad19ac4 BM	157	*
	158	* RETURN: Status
	159	*
	160	* DESCRIPTION: Handles all control ops encountered during control method
	161	* execution.
	162	*
	163	******************************************************************************/
	164
	165	acpi_status
	166	acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
	167	union acpi_parse_object * op)
	168	{
	169	acpi_status status = AE_OK;
	170	union acpi_generic_state *control_state;
	171
	172	ACPI_FUNCTION_NAME(ds_exec_end_control_op);
	173
	174	switch (op->common.aml_opcode) {
	175	case AML_IF_OP:
	176
	177	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
	178
	179	/*
	180	* Save the result of the predicate in case there is an
	181	* ELSE to come
	182	*/
	183	walk_state->last_predicate =
	184	(u8)walk_state->control_state->common.value;
	185
	186	/*
	187	* Pop the control state that was created at the start
	188	* of the IF and free it
	189	*/
	190	control_state =
	191	acpi_ut_pop_generic_state(&walk_state->control_state);
	192	acpi_ut_delete_generic_state(control_state);
	193	break;
	194
	195	case AML_ELSE_OP:
	196
	197	break;
	198
	199	case AML_WHILE_OP:
	200
	201	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
	202
	203	control_state = walk_state->control_state;
	204	if (control_state->common.value) {
	205
	206	/* Predicate was true, the body of the loop was just executed */
	207
	208	/*
	209	* This loop counter mechanism allows the interpreter to escape
	210	* possibly infinite loops. This can occur in poorly written AML
	211	* when the hardware does not respond within a while loop and the
	212	* loop does not implement a timeout.
	213	*/
	214	control_state->control.loop_count++;
	215	if (control_state->control.loop_count >
47cdf8c6	216	acpi_gbl_max_loop_iterations) {
9ad19ac4 BM	217	status = AE_AML_INFINITE_LOOP;
	218	break;
	219	}
	220
	221	/*
	222	* Go back and evaluate the predicate and maybe execute the loop
	223	* another time
	224	*/
	225	status = AE_CTRL_PENDING;
	226	walk_state->aml_last_while =
	227	control_state->control.aml_predicate_start;
	228	break;
	229	}
	230
	231	/* Predicate was false, terminate this while loop */
	232
	233	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
	234	"[WHILE_OP] termination! Op=%p\n", op));
	235
	236	/* Pop this control state and free it */
	237
	238	control_state =
	239	acpi_ut_pop_generic_state(&walk_state->control_state);
	240	acpi_ut_delete_generic_state(control_state);
	241	break;
	242
	243	case AML_RETURN_OP:
	244
	245	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
	246	"[RETURN_OP] Op=%p Arg=%p\n", op,
	247	op->common.value.arg));
	248
	249	/*
	250	* One optional operand -- the return value
	251	* It can be either an immediate operand or a result that
	252	* has been bubbled up the tree
	253	*/
	254	if (op->common.value.arg) {
	255
	256	/* Since we have a real Return(), delete any implicit return */
	257
	258	acpi_ds_clear_implicit_return(walk_state);
	259
	260	/* Return statement has an immediate operand */
	261
	262	status =
	263	acpi_ds_create_operands(walk_state,
	264	op->common.value.arg);
	265	if (ACPI_FAILURE(status)) {
	266	return (status);
	267	}
	268
	269	/*
	270	* If value being returned is a Reference (such as
	271	* an arg or local), resolve it now because it may
	272	* cease to exist at the end of the method.
	273	*/
	274	status =
	275	acpi_ex_resolve_to_value(&walk_state->operands[0],
	276	walk_state);
	277	if (ACPI_FAILURE(status)) {
	278	return (status);
	279	}
	280
281	/*
282	* Get the return value and save as the last result
73a3090a	283	* value. This is the only place where walk_state->return_desc
9ad19ac4 BM	284	* is set to anything other than zero!
	285	*/
	286	walk_state->return_desc = walk_state->operands[0];
	287	} else if (walk_state->result_count) {
	288
	289	/* Since we have a real Return(), delete any implicit return */
	290
	291	acpi_ds_clear_implicit_return(walk_state);
	292
	293	/*
	294	* The return value has come from a previous calculation.
	295	*
	296	* If value being returned is a Reference (such as
	297	* an arg or local), resolve it now because it may
	298	* cease to exist at the end of the method.
	299	*
	300	* Allow references created by the Index operator to return
	301	* unchanged.
	302	*/
	303	if ((ACPI_GET_DESCRIPTOR_TYPE
	304	(walk_state->results->results.obj_desc[0]) ==
	305	ACPI_DESC_TYPE_OPERAND)
	306	&& ((walk_state->results->results.obj_desc[0])->
	307	common.type == ACPI_TYPE_LOCAL_REFERENCE)
	308	&& ((walk_state->results->results.obj_desc[0])->
	309	reference.class != ACPI_REFCLASS_INDEX)) {
	310	status =
	311	acpi_ex_resolve_to_value(&walk_state->
	312	results->results.
	313	obj_desc[0],
	314	walk_state);
	315	if (ACPI_FAILURE(status)) {
	316	return (status);
	317	}
	318	}
	319
	320	walk_state->return_desc =
	321	walk_state->results->results.obj_desc[0];
	322	} else {
	323	/* No return operand */
	324
	325	if (walk_state->num_operands) {
	326	acpi_ut_remove_reference(walk_state->
	327	operands[0]);
	328	}
	329
	330	walk_state->operands[0] = NULL;
	331	walk_state->num_operands = 0;
	332	walk_state->return_desc = NULL;
	333	}
	334
	335	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
	336	"Completed RETURN_OP State=%p, RetVal=%p\n",
	337	walk_state, walk_state->return_desc));
	338
	339	/* End the control method execution right now */
	340
	341	status = AE_CTRL_TERMINATE;
	342	break;
	343
	344	case AML_NOOP_OP:
	345
	346	/* Just do nothing! */
1d1ea1b7	347
9ad19ac4 BM	348	break;
	349
	350	case AML_BREAK_POINT_OP:
	351
8a2a2501	352	acpi_db_signal_break_point(walk_state);
9ad19ac4 BM	353
	354	/* Call to the OSL in case OS wants a piece of the action */
	355
	356	status = acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
	357	"Executed AML Breakpoint opcode");
	358	break;
	359
	360	case AML_BREAK_OP:
	361	case AML_CONTINUE_OP: /* ACPI 2.0 */
	362
	363	/* Pop and delete control states until we find a while */
	364
	365	while (walk_state->control_state &&
	366	(walk_state->control_state->control.opcode !=
	367	AML_WHILE_OP)) {
	368	control_state =
	369	acpi_ut_pop_generic_state(&walk_state->
	370	control_state);
	371	acpi_ut_delete_generic_state(control_state);
	372	}
	373
	374	/* No while found? */
	375
	376	if (!walk_state->control_state) {
	377	return (AE_AML_NO_WHILE);
	378	}
	379
	380	/* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
	381
	382	walk_state->aml_last_while =
	383	walk_state->control_state->control.package_end;
	384
	385	/* Return status depending on opcode */
	386
	387	if (op->common.aml_opcode == AML_BREAK_OP) {
	388	status = AE_CTRL_BREAK;
	389	} else {
	390	status = AE_CTRL_CONTINUE;
	391	}
	392	break;
	393
	394	default:
	395
	396	ACPI_ERROR((AE_INFO, "Unknown control opcode=0x%X Op=%p",
	397	op->common.aml_opcode, op));
	398
	399	status = AE_AML_BAD_OPCODE;
	400	break;
	401	}
	402
	403	return (status);
	404	}