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1/******************************************************************************
2 *
3 * Module Name: dscontrol - Support for execution control opcodes -
4 * if/else/while/return
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2012, Intel Corp.
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"
50
51#define _COMPONENT ACPI_DISPATCHER
52ACPI_MODULE_NAME("dscontrol")
53
54/*******************************************************************************
55 *
56 * FUNCTION: acpi_ds_exec_begin_control_op
57 *
58 * PARAMETERS: walk_list - The list that owns the walk stack
59 * Op - The control Op
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Handles all control ops encountered during control method
64 * execution.
65 *
66 ******************************************************************************/
67acpi_status
68acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
69 union acpi_parse_object *op)
70{
71 acpi_status status = AE_OK;
72 union acpi_generic_state *control_state;
73
74 ACPI_FUNCTION_NAME(ds_exec_begin_control_op);
75
76 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n",
77 op, op->common.aml_opcode, walk_state));
78
79 switch (op->common.aml_opcode) {
80 case AML_WHILE_OP:
81
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:
102
103 /*
104 * IF/WHILE: Create a new control state to manage these
105 * constructs. We need to manage these as a stack, in order
106 * to handle nesting.
107 */
108 control_state = acpi_ut_create_control_state();
109 if (!control_state) {
110 status = AE_NO_MEMORY;
111 break;
112 }
113 /*
114 * Save a pointer to the predicate for multiple executions
115 * of a loop
116 */
117 control_state->control.aml_predicate_start =
118 walk_state->parser_state.aml - 1;
119 control_state->control.package_end =
120 walk_state->parser_state.pkg_end;
121 control_state->control.opcode = op->common.aml_opcode;
122
123 /* Push the control state on this walk's control stack */
124
125 acpi_ut_push_generic_state(&walk_state->control_state,
126 control_state);
127 break;
128
129 case AML_ELSE_OP:
130
131 /* Predicate is in the state object */
132 /* If predicate is true, the IF was executed, ignore ELSE part */
133
134 if (walk_state->last_predicate) {
135 status = AE_CTRL_TRUE;
136 }
137
138 break;
139
140 case AML_RETURN_OP:
141
142 break;
143
144 default:
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
156 * Op - The control Op
157 *
158 * RETURN: Status
159 *
160 * DESCRIPTION: Handles all control ops encountered during control method
161 * execution.
162 *
163 ******************************************************************************/
164
165acpi_status
166acpi_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 >
216 ACPI_MAX_LOOP_ITERATIONS) {
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
283 * value. This is the only place where walk_state->return_desc
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! */
347 break;
348
349 case AML_BREAK_POINT_OP:
350
351 /*
352 * Set the single-step flag. This will cause the debugger (if present)
353 * to break to the console within the AML debugger at the start of the
354 * next AML instruction.
355 */
356 ACPI_DEBUGGER_EXEC(acpi_gbl_cm_single_step = TRUE);
357 ACPI_DEBUGGER_EXEC(acpi_os_printf
358 ("**break** Executed AML BreakPoint opcode\n"));
359
360 /* Call to the OSL in case OS wants a piece of the action */
361
362 status = acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
363 "Executed AML Breakpoint opcode");
364 break;
365
366 case AML_BREAK_OP:
367 case AML_CONTINUE_OP: /* ACPI 2.0 */
368
369 /* Pop and delete control states until we find a while */
370
371 while (walk_state->control_state &&
372 (walk_state->control_state->control.opcode !=
373 AML_WHILE_OP)) {
374 control_state =
375 acpi_ut_pop_generic_state(&walk_state->
376 control_state);
377 acpi_ut_delete_generic_state(control_state);
378 }
379
380 /* No while found? */
381
382 if (!walk_state->control_state) {
383 return (AE_AML_NO_WHILE);
384 }
385
386 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
387
388 walk_state->aml_last_while =
389 walk_state->control_state->control.package_end;
390
391 /* Return status depending on opcode */
392
393 if (op->common.aml_opcode == AML_BREAK_OP) {
394 status = AE_CTRL_BREAK;
395 } else {
396 status = AE_CTRL_CONTINUE;
397 }
398 break;
399
400 default:
401
402 ACPI_ERROR((AE_INFO, "Unknown control opcode=0x%X Op=%p",
403 op->common.aml_opcode, op));
404
405 status = AE_AML_BAD_OPCODE;
406 break;
407 }
408
409 return (status);
410}
1/******************************************************************************
2 *
3 * Module Name: dscontrol - Support for execution control opcodes -
4 * if/else/while/return
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2014, Intel Corp.
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"
50
51#define _COMPONENT ACPI_DISPATCHER
52ACPI_MODULE_NAME("dscontrol")
53
54/*******************************************************************************
55 *
56 * FUNCTION: acpi_ds_exec_begin_control_op
57 *
58 * PARAMETERS: walk_list - The list that owns the walk stack
59 * op - The control Op
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Handles all control ops encountered during control method
64 * execution.
65 *
66 ******************************************************************************/
67acpi_status
68acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
69 union acpi_parse_object *op)
70{
71 acpi_status status = AE_OK;
72 union acpi_generic_state *control_state;
73
74 ACPI_FUNCTION_NAME(ds_exec_begin_control_op);
75
76 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n",
77 op, op->common.aml_opcode, walk_state));
78
79 switch (op->common.aml_opcode) {
80 case AML_WHILE_OP:
81 /*
82 * If this is an additional iteration of a while loop, continue.
83 * There is no need to allocate a new control state.
84 */
85 if (walk_state->control_state) {
86 if (walk_state->control_state->control.
87 aml_predicate_start ==
88 (walk_state->parser_state.aml - 1)) {
89
90 /* Reset the state to start-of-loop */
91
92 walk_state->control_state->common.state =
93 ACPI_CONTROL_CONDITIONAL_EXECUTING;
94 break;
95 }
96 }
97
98 /*lint -fallthrough */
99
100 case AML_IF_OP:
101 /*
102 * IF/WHILE: Create a new control state to manage these
103 * constructs. We need to manage these as a stack, in order
104 * to handle nesting.
105 */
106 control_state = acpi_ut_create_control_state();
107 if (!control_state) {
108 status = AE_NO_MEMORY;
109 break;
110 }
111 /*
112 * Save a pointer to the predicate for multiple executions
113 * of a loop
114 */
115 control_state->control.aml_predicate_start =
116 walk_state->parser_state.aml - 1;
117 control_state->control.package_end =
118 walk_state->parser_state.pkg_end;
119 control_state->control.opcode = op->common.aml_opcode;
120
121 /* Push the control state on this walk's control stack */
122
123 acpi_ut_push_generic_state(&walk_state->control_state,
124 control_state);
125 break;
126
127 case AML_ELSE_OP:
128
129 /* Predicate is in the state object */
130 /* If predicate is true, the IF was executed, ignore ELSE part */
131
132 if (walk_state->last_predicate) {
133 status = AE_CTRL_TRUE;
134 }
135
136 break;
137
138 case AML_RETURN_OP:
139
140 break;
141
142 default:
143
144 break;
145 }
146
147 return (status);
148}
149
150/*******************************************************************************
151 *
152 * FUNCTION: acpi_ds_exec_end_control_op
153 *
154 * PARAMETERS: walk_list - The list that owns the walk stack
155 * op - The control Op
156 *
157 * RETURN: Status
158 *
159 * DESCRIPTION: Handles all control ops encountered during control method
160 * execution.
161 *
162 ******************************************************************************/
163
164acpi_status
165acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
166 union acpi_parse_object * op)
167{
168 acpi_status status = AE_OK;
169 union acpi_generic_state *control_state;
170
171 ACPI_FUNCTION_NAME(ds_exec_end_control_op);
172
173 switch (op->common.aml_opcode) {
174 case AML_IF_OP:
175
176 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
177
178 /*
179 * Save the result of the predicate in case there is an
180 * ELSE to come
181 */
182 walk_state->last_predicate =
183 (u8)walk_state->control_state->common.value;
184
185 /*
186 * Pop the control state that was created at the start
187 * of the IF and free it
188 */
189 control_state =
190 acpi_ut_pop_generic_state(&walk_state->control_state);
191 acpi_ut_delete_generic_state(control_state);
192 break;
193
194 case AML_ELSE_OP:
195
196 break;
197
198 case AML_WHILE_OP:
199
200 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
201
202 control_state = walk_state->control_state;
203 if (control_state->common.value) {
204
205 /* Predicate was true, the body of the loop was just executed */
206
207 /*
208 * This loop counter mechanism allows the interpreter to escape
209 * possibly infinite loops. This can occur in poorly written AML
210 * when the hardware does not respond within a while loop and the
211 * loop does not implement a timeout.
212 */
213 control_state->control.loop_count++;
214 if (control_state->control.loop_count >
215 ACPI_MAX_LOOP_ITERATIONS) {
216 status = AE_AML_INFINITE_LOOP;
217 break;
218 }
219
220 /*
221 * Go back and evaluate the predicate and maybe execute the loop
222 * another time
223 */
224 status = AE_CTRL_PENDING;
225 walk_state->aml_last_while =
226 control_state->control.aml_predicate_start;
227 break;
228 }
229
230 /* Predicate was false, terminate this while loop */
231
232 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
233 "[WHILE_OP] termination! Op=%p\n", op));
234
235 /* Pop this control state and free it */
236
237 control_state =
238 acpi_ut_pop_generic_state(&walk_state->control_state);
239 acpi_ut_delete_generic_state(control_state);
240 break;
241
242 case AML_RETURN_OP:
243
244 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
245 "[RETURN_OP] Op=%p Arg=%p\n", op,
246 op->common.value.arg));
247
248 /*
249 * One optional operand -- the return value
250 * It can be either an immediate operand or a result that
251 * has been bubbled up the tree
252 */
253 if (op->common.value.arg) {
254
255 /* Since we have a real Return(), delete any implicit return */
256
257 acpi_ds_clear_implicit_return(walk_state);
258
259 /* Return statement has an immediate operand */
260
261 status =
262 acpi_ds_create_operands(walk_state,
263 op->common.value.arg);
264 if (ACPI_FAILURE(status)) {
265 return (status);
266 }
267
268 /*
269 * If value being returned is a Reference (such as
270 * an arg or local), resolve it now because it may
271 * cease to exist at the end of the method.
272 */
273 status =
274 acpi_ex_resolve_to_value(&walk_state->operands[0],
275 walk_state);
276 if (ACPI_FAILURE(status)) {
277 return (status);
278 }
279
280 /*
281 * Get the return value and save as the last result
282 * value. This is the only place where walk_state->return_desc
283 * is set to anything other than zero!
284 */
285 walk_state->return_desc = walk_state->operands[0];
286 } else if (walk_state->result_count) {
287
288 /* Since we have a real Return(), delete any implicit return */
289
290 acpi_ds_clear_implicit_return(walk_state);
291
292 /*
293 * The return value has come from a previous calculation.
294 *
295 * If value being returned is a Reference (such as
296 * an arg or local), resolve it now because it may
297 * cease to exist at the end of the method.
298 *
299 * Allow references created by the Index operator to return
300 * unchanged.
301 */
302 if ((ACPI_GET_DESCRIPTOR_TYPE
303 (walk_state->results->results.obj_desc[0]) ==
304 ACPI_DESC_TYPE_OPERAND)
305 && ((walk_state->results->results.obj_desc[0])->
306 common.type == ACPI_TYPE_LOCAL_REFERENCE)
307 && ((walk_state->results->results.obj_desc[0])->
308 reference.class != ACPI_REFCLASS_INDEX)) {
309 status =
310 acpi_ex_resolve_to_value(&walk_state->
311 results->results.
312 obj_desc[0],
313 walk_state);
314 if (ACPI_FAILURE(status)) {
315 return (status);
316 }
317 }
318
319 walk_state->return_desc =
320 walk_state->results->results.obj_desc[0];
321 } else {
322 /* No return operand */
323
324 if (walk_state->num_operands) {
325 acpi_ut_remove_reference(walk_state->
326 operands[0]);
327 }
328
329 walk_state->operands[0] = NULL;
330 walk_state->num_operands = 0;
331 walk_state->return_desc = NULL;
332 }
333
334 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
335 "Completed RETURN_OP State=%p, RetVal=%p\n",
336 walk_state, walk_state->return_desc));
337
338 /* End the control method execution right now */
339
340 status = AE_CTRL_TERMINATE;
341 break;
342
343 case AML_NOOP_OP:
344
345 /* Just do nothing! */
346
347 break;
348
349 case AML_BREAK_POINT_OP:
350
351 /*
352 * Set the single-step flag. This will cause the debugger (if present)
353 * to break to the console within the AML debugger at the start of the
354 * next AML instruction.
355 */
356 ACPI_DEBUGGER_EXEC(acpi_gbl_cm_single_step = TRUE);
357 ACPI_DEBUGGER_EXEC(acpi_os_printf
358 ("**break** Executed AML BreakPoint opcode\n"));
359
360 /* Call to the OSL in case OS wants a piece of the action */
361
362 status = acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
363 "Executed AML Breakpoint opcode");
364 break;
365
366 case AML_BREAK_OP:
367 case AML_CONTINUE_OP: /* ACPI 2.0 */
368
369 /* Pop and delete control states until we find a while */
370
371 while (walk_state->control_state &&
372 (walk_state->control_state->control.opcode !=
373 AML_WHILE_OP)) {
374 control_state =
375 acpi_ut_pop_generic_state(&walk_state->
376 control_state);
377 acpi_ut_delete_generic_state(control_state);
378 }
379
380 /* No while found? */
381
382 if (!walk_state->control_state) {
383 return (AE_AML_NO_WHILE);
384 }
385
386 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
387
388 walk_state->aml_last_while =
389 walk_state->control_state->control.package_end;
390
391 /* Return status depending on opcode */
392
393 if (op->common.aml_opcode == AML_BREAK_OP) {
394 status = AE_CTRL_BREAK;
395 } else {
396 status = AE_CTRL_CONTINUE;
397 }
398 break;
399
400 default:
401
402 ACPI_ERROR((AE_INFO, "Unknown control opcode=0x%X Op=%p",
403 op->common.aml_opcode, op));
404
405 status = AE_AML_BAD_OPCODE;
406 break;
407 }
408
409 return (status);
410}