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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psparse - Parser top level AML parse routines | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
7735ca0e | 8 | * Copyright (C) 2000 - 2017, Intel Corp. |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 LT |
44 | /* |
45 | * Parse the AML and build an operation tree as most interpreters, | |
73a3090a | 46 | * like Perl, do. Parsing is done by hand rather than with a YACC |
1da177e4 | 47 | * generated parser to tightly constrain stack and dynamic memory |
73a3090a | 48 | * usage. At the same time, parsing is kept flexible and the code |
1da177e4 LT |
49 | * fairly compact by parsing based on a list of AML opcode |
50 | * templates in aml_op_info[] | |
51 | */ | |
52 | ||
53 | #include <acpi/acpi.h> | |
e2f7a777 LB |
54 | #include "accommon.h" |
55 | #include "acparser.h" | |
56 | #include "acdispat.h" | |
57 | #include "amlcode.h" | |
e2f7a777 | 58 | #include "acinterp.h" |
fd13aaa8 | 59 | #include "acnamesp.h" |
1da177e4 LT |
60 | |
61 | #define _COMPONENT ACPI_PARSER | |
4be44fcd | 62 | ACPI_MODULE_NAME("psparse") |
1da177e4 | 63 | |
1da177e4 LT |
64 | /******************************************************************************* |
65 | * | |
66 | * FUNCTION: acpi_ps_get_opcode_size | |
67 | * | |
ba494bee | 68 | * PARAMETERS: opcode - An AML opcode |
1da177e4 LT |
69 | * |
70 | * RETURN: Size of the opcode, in bytes (1 or 2) | |
71 | * | |
72 | * DESCRIPTION: Get the size of the current opcode. | |
73 | * | |
74 | ******************************************************************************/ | |
4be44fcd | 75 | u32 acpi_ps_get_opcode_size(u32 opcode) |
1da177e4 LT |
76 | { |
77 | ||
78 | /* Extended (2-byte) opcode if > 255 */ | |
79 | ||
80 | if (opcode > 0x00FF) { | |
81 | return (2); | |
82 | } | |
83 | ||
84 | /* Otherwise, just a single byte opcode */ | |
85 | ||
86 | return (1); | |
87 | } | |
88 | ||
1da177e4 LT |
89 | /******************************************************************************* |
90 | * | |
91 | * FUNCTION: acpi_ps_peek_opcode | |
92 | * | |
93 | * PARAMETERS: parser_state - A parser state object | |
94 | * | |
44f6c012 | 95 | * RETURN: Next AML opcode |
1da177e4 LT |
96 | * |
97 | * DESCRIPTION: Get next AML opcode (without incrementing AML pointer) | |
98 | * | |
99 | ******************************************************************************/ | |
100 | ||
4be44fcd | 101 | u16 acpi_ps_peek_opcode(struct acpi_parse_state * parser_state) |
1da177e4 | 102 | { |
4be44fcd LB |
103 | u8 *aml; |
104 | u16 opcode; | |
1da177e4 LT |
105 | |
106 | aml = parser_state->aml; | |
4be44fcd | 107 | opcode = (u16) ACPI_GET8(aml); |
1da177e4 | 108 | |
9ff5a21a | 109 | if (opcode == AML_EXTENDED_PREFIX) { |
52fc0b02 | 110 | |
73459f73 | 111 | /* Extended opcode, get the second opcode byte */ |
1da177e4 LT |
112 | |
113 | aml++; | |
4be44fcd | 114 | opcode = (u16) ((opcode << 8) | ACPI_GET8(aml)); |
1da177e4 LT |
115 | } |
116 | ||
117 | return (opcode); | |
118 | } | |
119 | ||
1da177e4 LT |
120 | /******************************************************************************* |
121 | * | |
122 | * FUNCTION: acpi_ps_complete_this_op | |
123 | * | |
124 | * PARAMETERS: walk_state - Current State | |
ba494bee | 125 | * op - Op to complete |
1da177e4 | 126 | * |
88ac00f5 | 127 | * RETURN: Status |
1da177e4 LT |
128 | * |
129 | * DESCRIPTION: Perform any cleanup at the completion of an Op. | |
130 | * | |
131 | ******************************************************************************/ | |
132 | ||
73459f73 | 133 | acpi_status |
f5c1e1c5 LZ |
134 | acpi_ps_complete_this_op(struct acpi_walk_state *walk_state, |
135 | union acpi_parse_object *op) | |
1da177e4 | 136 | { |
4be44fcd LB |
137 | union acpi_parse_object *prev; |
138 | union acpi_parse_object *next; | |
139 | const struct acpi_opcode_info *parent_info; | |
140 | union acpi_parse_object *replacement_op = NULL; | |
c35def21 | 141 | acpi_status status = AE_OK; |
1da177e4 | 142 | |
b229cf92 | 143 | ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op); |
1da177e4 LT |
144 | |
145 | /* Check for null Op, can happen if AML code is corrupt */ | |
146 | ||
147 | if (!op) { | |
4be44fcd | 148 | return_ACPI_STATUS(AE_OK); /* OK for now */ |
1da177e4 LT |
149 | } |
150 | ||
ab6c5733 | 151 | acpi_ex_stop_trace_opcode(op, walk_state); |
a616dc2f | 152 | |
1da177e4 LT |
153 | /* Delete this op and the subtree below it if asked to */ |
154 | ||
4be44fcd LB |
155 | if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) != |
156 | ACPI_PARSE_DELETE_TREE) | |
157 | || (walk_state->op_info->class == AML_CLASS_ARGUMENT)) { | |
158 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
159 | } |
160 | ||
161 | /* Make sure that we only delete this subtree */ | |
162 | ||
163 | if (op->common.parent) { | |
88ac00f5 RM |
164 | prev = op->common.parent->common.value.arg; |
165 | if (!prev) { | |
52fc0b02 | 166 | |
88ac00f5 RM |
167 | /* Nothing more to do */ |
168 | ||
169 | goto cleanup; | |
170 | } | |
171 | ||
1da177e4 LT |
172 | /* |
173 | * Check if we need to replace the operator and its subtree | |
174 | * with a return value op (placeholder op) | |
175 | */ | |
4be44fcd LB |
176 | parent_info = |
177 | acpi_ps_get_opcode_info(op->common.parent->common. | |
178 | aml_opcode); | |
1da177e4 LT |
179 | |
180 | switch (parent_info->class) { | |
181 | case AML_CLASS_CONTROL: | |
1d1ea1b7 | 182 | |
1da177e4 LT |
183 | break; |
184 | ||
185 | case AML_CLASS_CREATE: | |
1da177e4 LT |
186 | /* |
187 | * These opcodes contain term_arg operands. The current | |
188 | * op must be replaced by a placeholder return op | |
189 | */ | |
4be44fcd | 190 | replacement_op = |
62eb935b LZ |
191 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP, |
192 | op->common.aml); | |
1da177e4 | 193 | if (!replacement_op) { |
c35def21 | 194 | status = AE_NO_MEMORY; |
1da177e4 LT |
195 | } |
196 | break; | |
197 | ||
198 | case AML_CLASS_NAMED_OBJECT: | |
1da177e4 LT |
199 | /* |
200 | * These opcodes contain term_arg operands. The current | |
201 | * op must be replaced by a placeholder return op | |
202 | */ | |
4be44fcd LB |
203 | if ((op->common.parent->common.aml_opcode == |
204 | AML_REGION_OP) | |
205 | || (op->common.parent->common.aml_opcode == | |
206 | AML_DATA_REGION_OP) | |
207 | || (op->common.parent->common.aml_opcode == | |
208 | AML_BUFFER_OP) | |
209 | || (op->common.parent->common.aml_opcode == | |
210 | AML_PACKAGE_OP) | |
ef805d95 LM |
211 | || (op->common.parent->common.aml_opcode == |
212 | AML_BANK_FIELD_OP) | |
4be44fcd | 213 | || (op->common.parent->common.aml_opcode == |
9ff5a21a | 214 | AML_VARIABLE_PACKAGE_OP)) { |
4be44fcd | 215 | replacement_op = |
62eb935b LZ |
216 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP, |
217 | op->common.aml); | |
1da177e4 | 218 | if (!replacement_op) { |
c35def21 | 219 | status = AE_NO_MEMORY; |
1da177e4 | 220 | } |
4be44fcd LB |
221 | } else |
222 | if ((op->common.parent->common.aml_opcode == | |
223 | AML_NAME_OP) | |
224 | && (walk_state->pass_number <= | |
225 | ACPI_IMODE_LOAD_PASS2)) { | |
226 | if ((op->common.aml_opcode == AML_BUFFER_OP) | |
227 | || (op->common.aml_opcode == AML_PACKAGE_OP) | |
228 | || (op->common.aml_opcode == | |
9ff5a21a | 229 | AML_VARIABLE_PACKAGE_OP)) { |
4be44fcd LB |
230 | replacement_op = |
231 | acpi_ps_alloc_op(op->common. | |
62eb935b LZ |
232 | aml_opcode, |
233 | op->common.aml); | |
1da177e4 | 234 | if (!replacement_op) { |
c35def21 LM |
235 | status = AE_NO_MEMORY; |
236 | } else { | |
237 | replacement_op->named.data = | |
238 | op->named.data; | |
239 | replacement_op->named.length = | |
240 | op->named.length; | |
1da177e4 | 241 | } |
1da177e4 LT |
242 | } |
243 | } | |
244 | break; | |
245 | ||
246 | default: | |
88ac00f5 | 247 | |
4be44fcd | 248 | replacement_op = |
62eb935b LZ |
249 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP, |
250 | op->common.aml); | |
1da177e4 | 251 | if (!replacement_op) { |
c35def21 | 252 | status = AE_NO_MEMORY; |
1da177e4 LT |
253 | } |
254 | } | |
255 | ||
256 | /* We must unlink this op from the parent tree */ | |
257 | ||
1da177e4 | 258 | if (prev == op) { |
52fc0b02 | 259 | |
1da177e4 LT |
260 | /* This op is the first in the list */ |
261 | ||
262 | if (replacement_op) { | |
4be44fcd LB |
263 | replacement_op->common.parent = |
264 | op->common.parent; | |
265 | replacement_op->common.value.arg = NULL; | |
266 | replacement_op->common.node = op->common.node; | |
267 | op->common.parent->common.value.arg = | |
268 | replacement_op; | |
269 | replacement_op->common.next = op->common.next; | |
270 | } else { | |
271 | op->common.parent->common.value.arg = | |
272 | op->common.next; | |
1da177e4 LT |
273 | } |
274 | } | |
275 | ||
276 | /* Search the parent list */ | |
277 | ||
4be44fcd LB |
278 | else |
279 | while (prev) { | |
52fc0b02 | 280 | |
4be44fcd LB |
281 | /* Traverse all siblings in the parent's argument list */ |
282 | ||
283 | next = prev->common.next; | |
284 | if (next == op) { | |
285 | if (replacement_op) { | |
286 | replacement_op->common.parent = | |
287 | op->common.parent; | |
288 | replacement_op->common.value. | |
289 | arg = NULL; | |
290 | replacement_op->common.node = | |
291 | op->common.node; | |
292 | prev->common.next = | |
293 | replacement_op; | |
294 | replacement_op->common.next = | |
295 | op->common.next; | |
296 | next = NULL; | |
297 | } else { | |
298 | prev->common.next = | |
299 | op->common.next; | |
300 | next = NULL; | |
301 | } | |
1da177e4 | 302 | } |
4be44fcd | 303 | prev = next; |
1da177e4 | 304 | } |
1da177e4 LT |
305 | } |
306 | ||
10622bf8 | 307 | cleanup: |
1da177e4 | 308 | |
44f6c012 | 309 | /* Now we can actually delete the subtree rooted at Op */ |
1da177e4 | 310 | |
4be44fcd | 311 | acpi_ps_delete_parse_tree(op); |
c35def21 | 312 | return_ACPI_STATUS(status); |
1da177e4 LT |
313 | } |
314 | ||
1da177e4 LT |
315 | /******************************************************************************* |
316 | * | |
317 | * FUNCTION: acpi_ps_next_parse_state | |
318 | * | |
44f6c012 | 319 | * PARAMETERS: walk_state - Current state |
ba494bee | 320 | * op - Current parse op |
44f6c012 | 321 | * callback_status - Status from previous operation |
1da177e4 LT |
322 | * |
323 | * RETURN: Status | |
324 | * | |
325 | * DESCRIPTION: Update the parser state based upon the return exception from | |
326 | * the parser callback. | |
327 | * | |
328 | ******************************************************************************/ | |
329 | ||
73459f73 | 330 | acpi_status |
4be44fcd LB |
331 | acpi_ps_next_parse_state(struct acpi_walk_state *walk_state, |
332 | union acpi_parse_object *op, | |
333 | acpi_status callback_status) | |
1da177e4 | 334 | { |
4be44fcd LB |
335 | struct acpi_parse_state *parser_state = &walk_state->parser_state; |
336 | acpi_status status = AE_CTRL_PENDING; | |
1da177e4 | 337 | |
b229cf92 | 338 | ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op); |
1da177e4 LT |
339 | |
340 | switch (callback_status) { | |
341 | case AE_CTRL_TERMINATE: | |
1da177e4 LT |
342 | /* |
343 | * A control method was terminated via a RETURN statement. | |
344 | * The walk of this method is complete. | |
345 | */ | |
346 | parser_state->aml = parser_state->aml_end; | |
347 | status = AE_CTRL_TERMINATE; | |
348 | break; | |
349 | ||
1da177e4 LT |
350 | case AE_CTRL_BREAK: |
351 | ||
352 | parser_state->aml = walk_state->aml_last_while; | |
353 | walk_state->control_state->common.value = FALSE; | |
773069d4 | 354 | status = AE_CTRL_BREAK; |
1da177e4 LT |
355 | break; |
356 | ||
357 | case AE_CTRL_CONTINUE: | |
358 | ||
1da177e4 | 359 | parser_state->aml = walk_state->aml_last_while; |
773069d4 | 360 | status = AE_CTRL_CONTINUE; |
1da177e4 LT |
361 | break; |
362 | ||
363 | case AE_CTRL_PENDING: | |
364 | ||
365 | parser_state->aml = walk_state->aml_last_while; | |
366 | break; | |
367 | ||
368 | #if 0 | |
369 | case AE_CTRL_SKIP: | |
370 | ||
371 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; | |
372 | status = AE_OK; | |
373 | break; | |
374 | #endif | |
375 | ||
376 | case AE_CTRL_TRUE: | |
1da177e4 LT |
377 | /* |
378 | * Predicate of an IF was true, and we are at the matching ELSE. | |
379 | * Just close out this package | |
380 | */ | |
4be44fcd | 381 | parser_state->aml = acpi_ps_get_next_package_end(parser_state); |
773069d4 | 382 | status = AE_CTRL_PENDING; |
1da177e4 LT |
383 | break; |
384 | ||
1da177e4 | 385 | case AE_CTRL_FALSE: |
1da177e4 LT |
386 | /* |
387 | * Either an IF/WHILE Predicate was false or we encountered a BREAK | |
73a3090a | 388 | * opcode. In both cases, we do not execute the rest of the |
1da177e4 LT |
389 | * package; We simply close out the parent (finishing the walk of |
390 | * this branch of the tree) and continue execution at the parent | |
391 | * level. | |
392 | */ | |
393 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; | |
394 | ||
395 | /* In the case of a BREAK, just force a predicate (if any) to FALSE */ | |
396 | ||
397 | walk_state->control_state->common.value = FALSE; | |
398 | status = AE_CTRL_END; | |
399 | break; | |
400 | ||
1da177e4 LT |
401 | case AE_CTRL_TRANSFER: |
402 | ||
44f6c012 RM |
403 | /* A method call (invocation) -- transfer control */ |
404 | ||
1da177e4 LT |
405 | status = AE_CTRL_TRANSFER; |
406 | walk_state->prev_op = op; | |
407 | walk_state->method_call_op = op; | |
4be44fcd LB |
408 | walk_state->method_call_node = |
409 | (op->common.value.arg)->common.node; | |
1da177e4 LT |
410 | |
411 | /* Will return value (if any) be used by the caller? */ | |
412 | ||
4be44fcd LB |
413 | walk_state->return_used = |
414 | acpi_ds_is_result_used(op, walk_state); | |
1da177e4 LT |
415 | break; |
416 | ||
1da177e4 | 417 | default: |
44f6c012 | 418 | |
1da177e4 LT |
419 | status = callback_status; |
420 | if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) { | |
421 | status = AE_OK; | |
422 | } | |
423 | break; | |
424 | } | |
425 | ||
4be44fcd | 426 | return_ACPI_STATUS(status); |
1da177e4 LT |
427 | } |
428 | ||
1da177e4 LT |
429 | /******************************************************************************* |
430 | * | |
431 | * FUNCTION: acpi_ps_parse_aml | |
432 | * | |
44f6c012 | 433 | * PARAMETERS: walk_state - Current state |
1da177e4 LT |
434 | * |
435 | * | |
436 | * RETURN: Status | |
437 | * | |
438 | * DESCRIPTION: Parse raw AML and return a tree of ops | |
439 | * | |
440 | ******************************************************************************/ | |
441 | ||
4be44fcd | 442 | acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state) |
1da177e4 | 443 | { |
4be44fcd | 444 | acpi_status status; |
4be44fcd LB |
445 | struct acpi_thread_state *thread; |
446 | struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list; | |
447 | struct acpi_walk_state *previous_walk_state; | |
1da177e4 | 448 | |
b229cf92 | 449 | ACPI_FUNCTION_TRACE(ps_parse_aml); |
1da177e4 | 450 | |
4be44fcd | 451 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 452 | "Entered with WalkState=%p Aml=%p size=%X\n", |
4be44fcd LB |
453 | walk_state, walk_state->parser_state.aml, |
454 | walk_state->parser_state.aml_size)); | |
1da177e4 | 455 | |
a8fadc92 BM |
456 | if (!walk_state->parser_state.aml) { |
457 | return_ACPI_STATUS(AE_NULL_OBJECT); | |
458 | } | |
459 | ||
1da177e4 LT |
460 | /* Create and initialize a new thread state */ |
461 | ||
4be44fcd | 462 | thread = acpi_ut_create_thread_state(); |
1da177e4 | 463 | if (!thread) { |
84d4db7c LM |
464 | if (walk_state->method_desc) { |
465 | ||
466 | /* Executing a control method - additional cleanup */ | |
467 | ||
1f86e8c1 LZ |
468 | acpi_ds_terminate_control_method(walk_state-> |
469 | method_desc, | |
470 | walk_state); | |
84d4db7c LM |
471 | } |
472 | ||
4119532c | 473 | acpi_ds_delete_walk_state(walk_state); |
4be44fcd | 474 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
475 | } |
476 | ||
477 | walk_state->thread = thread; | |
967440e3 BM |
478 | |
479 | /* | |
480 | * If executing a method, the starting sync_level is this method's | |
481 | * sync_level | |
482 | */ | |
483 | if (walk_state->method_desc) { | |
484 | walk_state->thread->current_sync_level = | |
485 | walk_state->method_desc->method.sync_level; | |
486 | } | |
487 | ||
4be44fcd | 488 | acpi_ds_push_walk_state(walk_state, thread); |
1da177e4 LT |
489 | |
490 | /* | |
491 | * This global allows the AML debugger to get a handle to the currently | |
492 | * executing control method. | |
493 | */ | |
494 | acpi_gbl_current_walk_list = thread; | |
495 | ||
496 | /* | |
73a3090a | 497 | * Execute the walk loop as long as there is a valid Walk State. This |
1da177e4 LT |
498 | * handles nested control method invocations without recursion. |
499 | */ | |
4be44fcd | 500 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state)); |
1da177e4 LT |
501 | |
502 | status = AE_OK; | |
503 | while (walk_state) { | |
4be44fcd | 504 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
505 | /* |
506 | * The parse_loop executes AML until the method terminates | |
507 | * or calls another method. | |
508 | */ | |
4be44fcd | 509 | status = acpi_ps_parse_loop(walk_state); |
1da177e4 LT |
510 | } |
511 | ||
4be44fcd LB |
512 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
513 | "Completed one call to walk loop, %s State=%p\n", | |
514 | acpi_format_exception(status), walk_state)); | |
1da177e4 LT |
515 | |
516 | if (status == AE_CTRL_TRANSFER) { | |
517 | /* | |
518 | * A method call was detected. | |
519 | * Transfer control to the called control method | |
520 | */ | |
4be44fcd LB |
521 | status = |
522 | acpi_ds_call_control_method(thread, walk_state, | |
523 | NULL); | |
967440e3 BM |
524 | if (ACPI_FAILURE(status)) { |
525 | status = | |
526 | acpi_ds_method_error(status, walk_state); | |
527 | } | |
1da177e4 LT |
528 | |
529 | /* | |
1fad8738 BM |
530 | * If the transfer to the new method method call worked |
531 | *, a new walk state was created -- get it | |
1da177e4 | 532 | */ |
4be44fcd | 533 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 534 | continue; |
4be44fcd | 535 | } else if (status == AE_CTRL_TERMINATE) { |
1da177e4 | 536 | status = AE_OK; |
4be44fcd | 537 | } else if ((status != AE_OK) && (walk_state->method_desc)) { |
52fc0b02 | 538 | |
c51a4de8 | 539 | /* Either the method parse or actual execution failed */ |
1da177e4 | 540 | |
441ad11d | 541 | acpi_ex_exit_interpreter(); |
fd13aaa8 BM |
542 | if (status == AE_ABORT_METHOD) { |
543 | acpi_ns_print_node_pathname(walk_state-> | |
544 | method_node, | |
545 | "Method aborted:"); | |
546 | acpi_os_printf("\n"); | |
547 | } else { | |
548 | ACPI_ERROR_METHOD | |
549 | ("Method parse/execution failed", | |
550 | walk_state->method_node, NULL, status); | |
551 | } | |
441ad11d | 552 | acpi_ex_enter_interpreter(); |
aff8c277 | 553 | |
1da177e4 LT |
554 | /* Check for possible multi-thread reentrancy problem */ |
555 | ||
556 | if ((status == AE_ALREADY_EXISTS) && | |
1fad8738 BM |
557 | (!(walk_state->method_desc->method.info_flags & |
558 | ACPI_METHOD_SERIALIZED))) { | |
1da177e4 | 559 | /* |
26294842 LM |
560 | * Method is not serialized and tried to create an object |
561 | * twice. The probable cause is that the method cannot | |
562 | * handle reentrancy. Mark as "pending serialized" now, and | |
563 | * then mark "serialized" when the last thread exits. | |
1da177e4 | 564 | */ |
26294842 LM |
565 | walk_state->method_desc->method.info_flags |= |
566 | ACPI_METHOD_SERIALIZED_PENDING; | |
1da177e4 LT |
567 | } |
568 | } | |
569 | ||
1da177e4 LT |
570 | /* We are done with this walk, move on to the parent if any */ |
571 | ||
4be44fcd | 572 | walk_state = acpi_ds_pop_walk_state(thread); |
1da177e4 LT |
573 | |
574 | /* Reset the current scope to the beginning of scope stack */ | |
575 | ||
4be44fcd | 576 | acpi_ds_scope_stack_clear(walk_state); |
1da177e4 LT |
577 | |
578 | /* | |
c51a4de8 BM |
579 | * If we just returned from the execution of a control method or if we |
580 | * encountered an error during the method parse phase, there's lots of | |
581 | * cleanup to do | |
1da177e4 | 582 | */ |
c51a4de8 | 583 | if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == |
de56ba95 LZ |
584 | ACPI_PARSE_EXECUTE && |
585 | !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) || | |
586 | (ACPI_FAILURE(status))) { | |
b229cf92 BM |
587 | acpi_ds_terminate_control_method(walk_state-> |
588 | method_desc, | |
589 | walk_state); | |
1da177e4 LT |
590 | } |
591 | ||
592 | /* Delete this walk state and all linked control states */ | |
593 | ||
4be44fcd | 594 | acpi_ps_cleanup_scope(&walk_state->parser_state); |
1da177e4 LT |
595 | previous_walk_state = walk_state; |
596 | ||
4be44fcd | 597 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 598 | "ReturnValue=%p, ImplicitValue=%p State=%p\n", |
4be44fcd LB |
599 | walk_state->return_desc, |
600 | walk_state->implicit_return_obj, walk_state)); | |
1da177e4 LT |
601 | |
602 | /* Check if we have restarted a preempted walk */ | |
603 | ||
4be44fcd | 604 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 605 | if (walk_state) { |
4be44fcd | 606 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
607 | /* |
608 | * There is another walk state, restart it. | |
609 | * If the method return value is not used by the parent, | |
610 | * The object is deleted | |
611 | */ | |
612 | if (!previous_walk_state->return_desc) { | |
9accd464 LM |
613 | /* |
614 | * In slack mode execution, if there is no return value | |
615 | * we should implicitly return zero (0) as a default value. | |
616 | */ | |
617 | if (acpi_gbl_enable_interpreter_slack && | |
618 | !previous_walk_state-> | |
619 | implicit_return_obj) { | |
620 | previous_walk_state-> | |
621 | implicit_return_obj = | |
dc95a270 BM |
622 | acpi_ut_create_integer_object |
623 | ((u64) 0); | |
9accd464 LM |
624 | if (!previous_walk_state-> |
625 | implicit_return_obj) { | |
626 | return_ACPI_STATUS | |
627 | (AE_NO_MEMORY); | |
628 | } | |
9accd464 LM |
629 | } |
630 | ||
631 | /* Restart the calling control method */ | |
632 | ||
4be44fcd LB |
633 | status = |
634 | acpi_ds_restart_control_method | |
635 | (walk_state, | |
636 | previous_walk_state-> | |
637 | implicit_return_obj); | |
638 | } else { | |
1da177e4 LT |
639 | /* |
640 | * We have a valid return value, delete any implicit | |
641 | * return value. | |
642 | */ | |
4be44fcd LB |
643 | acpi_ds_clear_implicit_return |
644 | (previous_walk_state); | |
1da177e4 | 645 | |
4be44fcd LB |
646 | status = |
647 | acpi_ds_restart_control_method | |
648 | (walk_state, | |
649 | previous_walk_state->return_desc); | |
1da177e4 | 650 | } |
4be44fcd LB |
651 | if (ACPI_SUCCESS(status)) { |
652 | walk_state->walk_type |= | |
653 | ACPI_WALK_METHOD_RESTART; | |
1da177e4 | 654 | } |
4be44fcd | 655 | } else { |
d8a0ec91 | 656 | /* On error, delete any return object or implicit return */ |
1da177e4 | 657 | |
4be44fcd LB |
658 | acpi_ut_remove_reference(previous_walk_state-> |
659 | return_desc); | |
d8a0ec91 LM |
660 | acpi_ds_clear_implicit_return |
661 | (previous_walk_state); | |
1da177e4 LT |
662 | } |
663 | } | |
664 | ||
665 | /* | |
666 | * Just completed a 1st-level method, save the final internal return | |
667 | * value (if any) | |
668 | */ | |
669 | else if (previous_walk_state->caller_return_desc) { | |
670 | if (previous_walk_state->implicit_return_obj) { | |
44f6c012 | 671 | *(previous_walk_state->caller_return_desc) = |
4be44fcd LB |
672 | previous_walk_state->implicit_return_obj; |
673 | } else { | |
674 | /* NULL if no return value */ | |
1da177e4 | 675 | |
44f6c012 | 676 | *(previous_walk_state->caller_return_desc) = |
4be44fcd | 677 | previous_walk_state->return_desc; |
1da177e4 | 678 | } |
4be44fcd | 679 | } else { |
1da177e4 | 680 | if (previous_walk_state->return_desc) { |
52fc0b02 | 681 | |
1da177e4 LT |
682 | /* Caller doesn't want it, must delete it */ |
683 | ||
4be44fcd LB |
684 | acpi_ut_remove_reference(previous_walk_state-> |
685 | return_desc); | |
1da177e4 LT |
686 | } |
687 | if (previous_walk_state->implicit_return_obj) { | |
52fc0b02 | 688 | |
1da177e4 LT |
689 | /* Caller doesn't want it, must delete it */ |
690 | ||
4be44fcd LB |
691 | acpi_ut_remove_reference(previous_walk_state-> |
692 | implicit_return_obj); | |
1da177e4 LT |
693 | } |
694 | } | |
695 | ||
4be44fcd | 696 | acpi_ds_delete_walk_state(previous_walk_state); |
1da177e4 LT |
697 | } |
698 | ||
699 | /* Normal exit */ | |
700 | ||
4be44fcd LB |
701 | acpi_ex_release_all_mutexes(thread); |
702 | acpi_ut_delete_generic_state(ACPI_CAST_PTR | |
703 | (union acpi_generic_state, thread)); | |
1da177e4 | 704 | acpi_gbl_current_walk_list = prev_walk_list; |
4be44fcd | 705 | return_ACPI_STATUS(status); |
1da177e4 | 706 | } |