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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psparse - Parser top level AML parse routines | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
82a80941 | 8 | * Copyright (C) 2000 - 2015, 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" |
1da177e4 LT |
59 | |
60 | #define _COMPONENT ACPI_PARSER | |
4be44fcd | 61 | ACPI_MODULE_NAME("psparse") |
1da177e4 | 62 | |
1da177e4 LT |
63 | /******************************************************************************* |
64 | * | |
65 | * FUNCTION: acpi_ps_get_opcode_size | |
66 | * | |
ba494bee | 67 | * PARAMETERS: opcode - An AML opcode |
1da177e4 LT |
68 | * |
69 | * RETURN: Size of the opcode, in bytes (1 or 2) | |
70 | * | |
71 | * DESCRIPTION: Get the size of the current opcode. | |
72 | * | |
73 | ******************************************************************************/ | |
4be44fcd | 74 | u32 acpi_ps_get_opcode_size(u32 opcode) |
1da177e4 LT |
75 | { |
76 | ||
77 | /* Extended (2-byte) opcode if > 255 */ | |
78 | ||
79 | if (opcode > 0x00FF) { | |
80 | return (2); | |
81 | } | |
82 | ||
83 | /* Otherwise, just a single byte opcode */ | |
84 | ||
85 | return (1); | |
86 | } | |
87 | ||
1da177e4 LT |
88 | /******************************************************************************* |
89 | * | |
90 | * FUNCTION: acpi_ps_peek_opcode | |
91 | * | |
92 | * PARAMETERS: parser_state - A parser state object | |
93 | * | |
44f6c012 | 94 | * RETURN: Next AML opcode |
1da177e4 LT |
95 | * |
96 | * DESCRIPTION: Get next AML opcode (without incrementing AML pointer) | |
97 | * | |
98 | ******************************************************************************/ | |
99 | ||
4be44fcd | 100 | u16 acpi_ps_peek_opcode(struct acpi_parse_state * parser_state) |
1da177e4 | 101 | { |
4be44fcd LB |
102 | u8 *aml; |
103 | u16 opcode; | |
1da177e4 LT |
104 | |
105 | aml = parser_state->aml; | |
4be44fcd | 106 | opcode = (u16) ACPI_GET8(aml); |
1da177e4 | 107 | |
73459f73 | 108 | if (opcode == AML_EXTENDED_OP_PREFIX) { |
52fc0b02 | 109 | |
73459f73 | 110 | /* Extended opcode, get the second opcode byte */ |
1da177e4 LT |
111 | |
112 | aml++; | |
4be44fcd | 113 | opcode = (u16) ((opcode << 8) | ACPI_GET8(aml)); |
1da177e4 LT |
114 | } |
115 | ||
116 | return (opcode); | |
117 | } | |
118 | ||
1da177e4 LT |
119 | /******************************************************************************* |
120 | * | |
121 | * FUNCTION: acpi_ps_complete_this_op | |
122 | * | |
123 | * PARAMETERS: walk_state - Current State | |
ba494bee | 124 | * op - Op to complete |
1da177e4 | 125 | * |
88ac00f5 | 126 | * RETURN: Status |
1da177e4 LT |
127 | * |
128 | * DESCRIPTION: Perform any cleanup at the completion of an Op. | |
129 | * | |
130 | ******************************************************************************/ | |
131 | ||
73459f73 | 132 | acpi_status |
4be44fcd LB |
133 | acpi_ps_complete_this_op(struct acpi_walk_state * walk_state, |
134 | union acpi_parse_object * op) | |
1da177e4 | 135 | { |
4be44fcd LB |
136 | union acpi_parse_object *prev; |
137 | union acpi_parse_object *next; | |
138 | const struct acpi_opcode_info *parent_info; | |
139 | union acpi_parse_object *replacement_op = NULL; | |
c35def21 | 140 | acpi_status status = AE_OK; |
1da177e4 | 141 | |
b229cf92 | 142 | ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op); |
1da177e4 LT |
143 | |
144 | /* Check for null Op, can happen if AML code is corrupt */ | |
145 | ||
146 | if (!op) { | |
4be44fcd | 147 | return_ACPI_STATUS(AE_OK); /* OK for now */ |
1da177e4 LT |
148 | } |
149 | ||
150 | /* Delete this op and the subtree below it if asked to */ | |
151 | ||
4be44fcd LB |
152 | if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) != |
153 | ACPI_PARSE_DELETE_TREE) | |
154 | || (walk_state->op_info->class == AML_CLASS_ARGUMENT)) { | |
155 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
156 | } |
157 | ||
158 | /* Make sure that we only delete this subtree */ | |
159 | ||
160 | if (op->common.parent) { | |
88ac00f5 RM |
161 | prev = op->common.parent->common.value.arg; |
162 | if (!prev) { | |
52fc0b02 | 163 | |
88ac00f5 RM |
164 | /* Nothing more to do */ |
165 | ||
166 | goto cleanup; | |
167 | } | |
168 | ||
1da177e4 LT |
169 | /* |
170 | * Check if we need to replace the operator and its subtree | |
171 | * with a return value op (placeholder op) | |
172 | */ | |
4be44fcd LB |
173 | parent_info = |
174 | acpi_ps_get_opcode_info(op->common.parent->common. | |
175 | aml_opcode); | |
1da177e4 LT |
176 | |
177 | switch (parent_info->class) { | |
178 | case AML_CLASS_CONTROL: | |
1d1ea1b7 | 179 | |
1da177e4 LT |
180 | break; |
181 | ||
182 | case AML_CLASS_CREATE: | |
1da177e4 LT |
183 | /* |
184 | * These opcodes contain term_arg operands. The current | |
185 | * op must be replaced by a placeholder return op | |
186 | */ | |
4be44fcd LB |
187 | replacement_op = |
188 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); | |
1da177e4 | 189 | if (!replacement_op) { |
c35def21 | 190 | status = AE_NO_MEMORY; |
1da177e4 LT |
191 | } |
192 | break; | |
193 | ||
194 | case AML_CLASS_NAMED_OBJECT: | |
1da177e4 LT |
195 | /* |
196 | * These opcodes contain term_arg operands. The current | |
197 | * op must be replaced by a placeholder return op | |
198 | */ | |
4be44fcd LB |
199 | if ((op->common.parent->common.aml_opcode == |
200 | AML_REGION_OP) | |
201 | || (op->common.parent->common.aml_opcode == | |
202 | AML_DATA_REGION_OP) | |
203 | || (op->common.parent->common.aml_opcode == | |
204 | AML_BUFFER_OP) | |
205 | || (op->common.parent->common.aml_opcode == | |
206 | AML_PACKAGE_OP) | |
ef805d95 LM |
207 | || (op->common.parent->common.aml_opcode == |
208 | AML_BANK_FIELD_OP) | |
4be44fcd LB |
209 | || (op->common.parent->common.aml_opcode == |
210 | AML_VAR_PACKAGE_OP)) { | |
211 | replacement_op = | |
212 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); | |
1da177e4 | 213 | if (!replacement_op) { |
c35def21 | 214 | status = AE_NO_MEMORY; |
1da177e4 | 215 | } |
4be44fcd LB |
216 | } else |
217 | if ((op->common.parent->common.aml_opcode == | |
218 | AML_NAME_OP) | |
219 | && (walk_state->pass_number <= | |
220 | ACPI_IMODE_LOAD_PASS2)) { | |
221 | if ((op->common.aml_opcode == AML_BUFFER_OP) | |
222 | || (op->common.aml_opcode == AML_PACKAGE_OP) | |
223 | || (op->common.aml_opcode == | |
224 | AML_VAR_PACKAGE_OP)) { | |
225 | replacement_op = | |
226 | acpi_ps_alloc_op(op->common. | |
227 | aml_opcode); | |
1da177e4 | 228 | if (!replacement_op) { |
c35def21 LM |
229 | status = AE_NO_MEMORY; |
230 | } else { | |
231 | replacement_op->named.data = | |
232 | op->named.data; | |
233 | replacement_op->named.length = | |
234 | op->named.length; | |
1da177e4 | 235 | } |
1da177e4 LT |
236 | } |
237 | } | |
238 | break; | |
239 | ||
240 | default: | |
88ac00f5 | 241 | |
4be44fcd LB |
242 | replacement_op = |
243 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); | |
1da177e4 | 244 | if (!replacement_op) { |
c35def21 | 245 | status = AE_NO_MEMORY; |
1da177e4 LT |
246 | } |
247 | } | |
248 | ||
249 | /* We must unlink this op from the parent tree */ | |
250 | ||
1da177e4 | 251 | if (prev == op) { |
52fc0b02 | 252 | |
1da177e4 LT |
253 | /* This op is the first in the list */ |
254 | ||
255 | if (replacement_op) { | |
4be44fcd LB |
256 | replacement_op->common.parent = |
257 | op->common.parent; | |
258 | replacement_op->common.value.arg = NULL; | |
259 | replacement_op->common.node = op->common.node; | |
260 | op->common.parent->common.value.arg = | |
261 | replacement_op; | |
262 | replacement_op->common.next = op->common.next; | |
263 | } else { | |
264 | op->common.parent->common.value.arg = | |
265 | op->common.next; | |
1da177e4 LT |
266 | } |
267 | } | |
268 | ||
269 | /* Search the parent list */ | |
270 | ||
4be44fcd LB |
271 | else |
272 | while (prev) { | |
52fc0b02 | 273 | |
4be44fcd LB |
274 | /* Traverse all siblings in the parent's argument list */ |
275 | ||
276 | next = prev->common.next; | |
277 | if (next == op) { | |
278 | if (replacement_op) { | |
279 | replacement_op->common.parent = | |
280 | op->common.parent; | |
281 | replacement_op->common.value. | |
282 | arg = NULL; | |
283 | replacement_op->common.node = | |
284 | op->common.node; | |
285 | prev->common.next = | |
286 | replacement_op; | |
287 | replacement_op->common.next = | |
288 | op->common.next; | |
289 | next = NULL; | |
290 | } else { | |
291 | prev->common.next = | |
292 | op->common.next; | |
293 | next = NULL; | |
294 | } | |
1da177e4 | 295 | } |
4be44fcd | 296 | prev = next; |
1da177e4 | 297 | } |
1da177e4 LT |
298 | } |
299 | ||
10622bf8 | 300 | cleanup: |
1da177e4 | 301 | |
44f6c012 | 302 | /* Now we can actually delete the subtree rooted at Op */ |
1da177e4 | 303 | |
4be44fcd | 304 | acpi_ps_delete_parse_tree(op); |
c35def21 | 305 | return_ACPI_STATUS(status); |
1da177e4 LT |
306 | } |
307 | ||
1da177e4 LT |
308 | /******************************************************************************* |
309 | * | |
310 | * FUNCTION: acpi_ps_next_parse_state | |
311 | * | |
44f6c012 | 312 | * PARAMETERS: walk_state - Current state |
ba494bee | 313 | * op - Current parse op |
44f6c012 | 314 | * callback_status - Status from previous operation |
1da177e4 LT |
315 | * |
316 | * RETURN: Status | |
317 | * | |
318 | * DESCRIPTION: Update the parser state based upon the return exception from | |
319 | * the parser callback. | |
320 | * | |
321 | ******************************************************************************/ | |
322 | ||
73459f73 | 323 | acpi_status |
4be44fcd LB |
324 | acpi_ps_next_parse_state(struct acpi_walk_state *walk_state, |
325 | union acpi_parse_object *op, | |
326 | acpi_status callback_status) | |
1da177e4 | 327 | { |
4be44fcd LB |
328 | struct acpi_parse_state *parser_state = &walk_state->parser_state; |
329 | acpi_status status = AE_CTRL_PENDING; | |
1da177e4 | 330 | |
b229cf92 | 331 | ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op); |
1da177e4 LT |
332 | |
333 | switch (callback_status) { | |
334 | case AE_CTRL_TERMINATE: | |
1da177e4 LT |
335 | /* |
336 | * A control method was terminated via a RETURN statement. | |
337 | * The walk of this method is complete. | |
338 | */ | |
339 | parser_state->aml = parser_state->aml_end; | |
340 | status = AE_CTRL_TERMINATE; | |
341 | break; | |
342 | ||
1da177e4 LT |
343 | case AE_CTRL_BREAK: |
344 | ||
345 | parser_state->aml = walk_state->aml_last_while; | |
346 | walk_state->control_state->common.value = FALSE; | |
773069d4 | 347 | status = AE_CTRL_BREAK; |
1da177e4 LT |
348 | break; |
349 | ||
350 | case AE_CTRL_CONTINUE: | |
351 | ||
1da177e4 | 352 | parser_state->aml = walk_state->aml_last_while; |
773069d4 | 353 | status = AE_CTRL_CONTINUE; |
1da177e4 LT |
354 | break; |
355 | ||
356 | case AE_CTRL_PENDING: | |
357 | ||
358 | parser_state->aml = walk_state->aml_last_while; | |
359 | break; | |
360 | ||
361 | #if 0 | |
362 | case AE_CTRL_SKIP: | |
363 | ||
364 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; | |
365 | status = AE_OK; | |
366 | break; | |
367 | #endif | |
368 | ||
369 | case AE_CTRL_TRUE: | |
1da177e4 LT |
370 | /* |
371 | * Predicate of an IF was true, and we are at the matching ELSE. | |
372 | * Just close out this package | |
373 | */ | |
4be44fcd | 374 | parser_state->aml = acpi_ps_get_next_package_end(parser_state); |
773069d4 | 375 | status = AE_CTRL_PENDING; |
1da177e4 LT |
376 | break; |
377 | ||
1da177e4 | 378 | case AE_CTRL_FALSE: |
1da177e4 LT |
379 | /* |
380 | * Either an IF/WHILE Predicate was false or we encountered a BREAK | |
73a3090a | 381 | * opcode. In both cases, we do not execute the rest of the |
1da177e4 LT |
382 | * package; We simply close out the parent (finishing the walk of |
383 | * this branch of the tree) and continue execution at the parent | |
384 | * level. | |
385 | */ | |
386 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; | |
387 | ||
388 | /* In the case of a BREAK, just force a predicate (if any) to FALSE */ | |
389 | ||
390 | walk_state->control_state->common.value = FALSE; | |
391 | status = AE_CTRL_END; | |
392 | break; | |
393 | ||
1da177e4 LT |
394 | case AE_CTRL_TRANSFER: |
395 | ||
44f6c012 RM |
396 | /* A method call (invocation) -- transfer control */ |
397 | ||
1da177e4 LT |
398 | status = AE_CTRL_TRANSFER; |
399 | walk_state->prev_op = op; | |
400 | walk_state->method_call_op = op; | |
4be44fcd LB |
401 | walk_state->method_call_node = |
402 | (op->common.value.arg)->common.node; | |
1da177e4 LT |
403 | |
404 | /* Will return value (if any) be used by the caller? */ | |
405 | ||
4be44fcd LB |
406 | walk_state->return_used = |
407 | acpi_ds_is_result_used(op, walk_state); | |
1da177e4 LT |
408 | break; |
409 | ||
1da177e4 | 410 | default: |
44f6c012 | 411 | |
1da177e4 LT |
412 | status = callback_status; |
413 | if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) { | |
414 | status = AE_OK; | |
415 | } | |
416 | break; | |
417 | } | |
418 | ||
4be44fcd | 419 | return_ACPI_STATUS(status); |
1da177e4 LT |
420 | } |
421 | ||
1da177e4 LT |
422 | /******************************************************************************* |
423 | * | |
424 | * FUNCTION: acpi_ps_parse_aml | |
425 | * | |
44f6c012 | 426 | * PARAMETERS: walk_state - Current state |
1da177e4 LT |
427 | * |
428 | * | |
429 | * RETURN: Status | |
430 | * | |
431 | * DESCRIPTION: Parse raw AML and return a tree of ops | |
432 | * | |
433 | ******************************************************************************/ | |
434 | ||
4be44fcd | 435 | acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state) |
1da177e4 | 436 | { |
4be44fcd | 437 | acpi_status status; |
4be44fcd LB |
438 | struct acpi_thread_state *thread; |
439 | struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list; | |
440 | struct acpi_walk_state *previous_walk_state; | |
1da177e4 | 441 | |
b229cf92 | 442 | ACPI_FUNCTION_TRACE(ps_parse_aml); |
1da177e4 | 443 | |
4be44fcd | 444 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 445 | "Entered with WalkState=%p Aml=%p size=%X\n", |
4be44fcd LB |
446 | walk_state, walk_state->parser_state.aml, |
447 | walk_state->parser_state.aml_size)); | |
1da177e4 | 448 | |
a8fadc92 BM |
449 | if (!walk_state->parser_state.aml) { |
450 | return_ACPI_STATUS(AE_NULL_OBJECT); | |
451 | } | |
452 | ||
1da177e4 LT |
453 | /* Create and initialize a new thread state */ |
454 | ||
4be44fcd | 455 | thread = acpi_ut_create_thread_state(); |
1da177e4 | 456 | if (!thread) { |
84d4db7c LM |
457 | if (walk_state->method_desc) { |
458 | ||
459 | /* Executing a control method - additional cleanup */ | |
460 | ||
1f86e8c1 LZ |
461 | acpi_ds_terminate_control_method(walk_state-> |
462 | method_desc, | |
463 | walk_state); | |
84d4db7c LM |
464 | } |
465 | ||
4119532c | 466 | acpi_ds_delete_walk_state(walk_state); |
4be44fcd | 467 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
468 | } |
469 | ||
470 | walk_state->thread = thread; | |
967440e3 BM |
471 | |
472 | /* | |
473 | * If executing a method, the starting sync_level is this method's | |
474 | * sync_level | |
475 | */ | |
476 | if (walk_state->method_desc) { | |
477 | walk_state->thread->current_sync_level = | |
478 | walk_state->method_desc->method.sync_level; | |
479 | } | |
480 | ||
4be44fcd | 481 | acpi_ds_push_walk_state(walk_state, thread); |
1da177e4 LT |
482 | |
483 | /* | |
484 | * This global allows the AML debugger to get a handle to the currently | |
485 | * executing control method. | |
486 | */ | |
487 | acpi_gbl_current_walk_list = thread; | |
488 | ||
489 | /* | |
73a3090a | 490 | * Execute the walk loop as long as there is a valid Walk State. This |
1da177e4 LT |
491 | * handles nested control method invocations without recursion. |
492 | */ | |
4be44fcd | 493 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state)); |
1da177e4 LT |
494 | |
495 | status = AE_OK; | |
496 | while (walk_state) { | |
4be44fcd | 497 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
498 | /* |
499 | * The parse_loop executes AML until the method terminates | |
500 | * or calls another method. | |
501 | */ | |
4be44fcd | 502 | status = acpi_ps_parse_loop(walk_state); |
1da177e4 LT |
503 | } |
504 | ||
4be44fcd LB |
505 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
506 | "Completed one call to walk loop, %s State=%p\n", | |
507 | acpi_format_exception(status), walk_state)); | |
1da177e4 LT |
508 | |
509 | if (status == AE_CTRL_TRANSFER) { | |
510 | /* | |
511 | * A method call was detected. | |
512 | * Transfer control to the called control method | |
513 | */ | |
4be44fcd LB |
514 | status = |
515 | acpi_ds_call_control_method(thread, walk_state, | |
516 | NULL); | |
967440e3 BM |
517 | if (ACPI_FAILURE(status)) { |
518 | status = | |
519 | acpi_ds_method_error(status, walk_state); | |
520 | } | |
1da177e4 LT |
521 | |
522 | /* | |
523 | * If the transfer to the new method method call worked, a new walk | |
524 | * state was created -- get it | |
525 | */ | |
4be44fcd | 526 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 527 | continue; |
4be44fcd | 528 | } else if (status == AE_CTRL_TERMINATE) { |
1da177e4 | 529 | status = AE_OK; |
4be44fcd | 530 | } else if ((status != AE_OK) && (walk_state->method_desc)) { |
52fc0b02 | 531 | |
c51a4de8 | 532 | /* Either the method parse or actual execution failed */ |
1da177e4 | 533 | |
b8e4d893 BM |
534 | ACPI_ERROR_METHOD("Method parse/execution failed", |
535 | walk_state->method_node, NULL, | |
536 | status); | |
aff8c277 | 537 | |
1da177e4 LT |
538 | /* Check for possible multi-thread reentrancy problem */ |
539 | ||
540 | if ((status == AE_ALREADY_EXISTS) && | |
26294842 LM |
541 | (!(walk_state->method_desc->method. |
542 | info_flags & ACPI_METHOD_SERIALIZED))) { | |
1da177e4 | 543 | /* |
26294842 LM |
544 | * Method is not serialized and tried to create an object |
545 | * twice. The probable cause is that the method cannot | |
546 | * handle reentrancy. Mark as "pending serialized" now, and | |
547 | * then mark "serialized" when the last thread exits. | |
1da177e4 | 548 | */ |
26294842 LM |
549 | walk_state->method_desc->method.info_flags |= |
550 | ACPI_METHOD_SERIALIZED_PENDING; | |
1da177e4 LT |
551 | } |
552 | } | |
553 | ||
1da177e4 LT |
554 | /* We are done with this walk, move on to the parent if any */ |
555 | ||
4be44fcd | 556 | walk_state = acpi_ds_pop_walk_state(thread); |
1da177e4 LT |
557 | |
558 | /* Reset the current scope to the beginning of scope stack */ | |
559 | ||
4be44fcd | 560 | acpi_ds_scope_stack_clear(walk_state); |
1da177e4 LT |
561 | |
562 | /* | |
c51a4de8 BM |
563 | * If we just returned from the execution of a control method or if we |
564 | * encountered an error during the method parse phase, there's lots of | |
565 | * cleanup to do | |
1da177e4 | 566 | */ |
c51a4de8 BM |
567 | if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == |
568 | ACPI_PARSE_EXECUTE) || (ACPI_FAILURE(status))) { | |
b229cf92 BM |
569 | acpi_ds_terminate_control_method(walk_state-> |
570 | method_desc, | |
571 | walk_state); | |
1da177e4 LT |
572 | } |
573 | ||
574 | /* Delete this walk state and all linked control states */ | |
575 | ||
4be44fcd | 576 | acpi_ps_cleanup_scope(&walk_state->parser_state); |
1da177e4 LT |
577 | previous_walk_state = walk_state; |
578 | ||
4be44fcd | 579 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 580 | "ReturnValue=%p, ImplicitValue=%p State=%p\n", |
4be44fcd LB |
581 | walk_state->return_desc, |
582 | walk_state->implicit_return_obj, walk_state)); | |
1da177e4 LT |
583 | |
584 | /* Check if we have restarted a preempted walk */ | |
585 | ||
4be44fcd | 586 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 587 | if (walk_state) { |
4be44fcd | 588 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
589 | /* |
590 | * There is another walk state, restart it. | |
591 | * If the method return value is not used by the parent, | |
592 | * The object is deleted | |
593 | */ | |
594 | if (!previous_walk_state->return_desc) { | |
9accd464 LM |
595 | /* |
596 | * In slack mode execution, if there is no return value | |
597 | * we should implicitly return zero (0) as a default value. | |
598 | */ | |
599 | if (acpi_gbl_enable_interpreter_slack && | |
600 | !previous_walk_state-> | |
601 | implicit_return_obj) { | |
602 | previous_walk_state-> | |
603 | implicit_return_obj = | |
dc95a270 BM |
604 | acpi_ut_create_integer_object |
605 | ((u64) 0); | |
9accd464 LM |
606 | if (!previous_walk_state-> |
607 | implicit_return_obj) { | |
608 | return_ACPI_STATUS | |
609 | (AE_NO_MEMORY); | |
610 | } | |
9accd464 LM |
611 | } |
612 | ||
613 | /* Restart the calling control method */ | |
614 | ||
4be44fcd LB |
615 | status = |
616 | acpi_ds_restart_control_method | |
617 | (walk_state, | |
618 | previous_walk_state-> | |
619 | implicit_return_obj); | |
620 | } else { | |
1da177e4 LT |
621 | /* |
622 | * We have a valid return value, delete any implicit | |
623 | * return value. | |
624 | */ | |
4be44fcd LB |
625 | acpi_ds_clear_implicit_return |
626 | (previous_walk_state); | |
1da177e4 | 627 | |
4be44fcd LB |
628 | status = |
629 | acpi_ds_restart_control_method | |
630 | (walk_state, | |
631 | previous_walk_state->return_desc); | |
1da177e4 | 632 | } |
4be44fcd LB |
633 | if (ACPI_SUCCESS(status)) { |
634 | walk_state->walk_type |= | |
635 | ACPI_WALK_METHOD_RESTART; | |
1da177e4 | 636 | } |
4be44fcd | 637 | } else { |
d8a0ec91 | 638 | /* On error, delete any return object or implicit return */ |
1da177e4 | 639 | |
4be44fcd LB |
640 | acpi_ut_remove_reference(previous_walk_state-> |
641 | return_desc); | |
d8a0ec91 LM |
642 | acpi_ds_clear_implicit_return |
643 | (previous_walk_state); | |
1da177e4 LT |
644 | } |
645 | } | |
646 | ||
647 | /* | |
648 | * Just completed a 1st-level method, save the final internal return | |
649 | * value (if any) | |
650 | */ | |
651 | else if (previous_walk_state->caller_return_desc) { | |
652 | if (previous_walk_state->implicit_return_obj) { | |
44f6c012 | 653 | *(previous_walk_state->caller_return_desc) = |
4be44fcd LB |
654 | previous_walk_state->implicit_return_obj; |
655 | } else { | |
656 | /* NULL if no return value */ | |
1da177e4 | 657 | |
44f6c012 | 658 | *(previous_walk_state->caller_return_desc) = |
4be44fcd | 659 | previous_walk_state->return_desc; |
1da177e4 | 660 | } |
4be44fcd | 661 | } else { |
1da177e4 | 662 | if (previous_walk_state->return_desc) { |
52fc0b02 | 663 | |
1da177e4 LT |
664 | /* Caller doesn't want it, must delete it */ |
665 | ||
4be44fcd LB |
666 | acpi_ut_remove_reference(previous_walk_state-> |
667 | return_desc); | |
1da177e4 LT |
668 | } |
669 | if (previous_walk_state->implicit_return_obj) { | |
52fc0b02 | 670 | |
1da177e4 LT |
671 | /* Caller doesn't want it, must delete it */ |
672 | ||
4be44fcd LB |
673 | acpi_ut_remove_reference(previous_walk_state-> |
674 | implicit_return_obj); | |
1da177e4 LT |
675 | } |
676 | } | |
677 | ||
4be44fcd | 678 | acpi_ds_delete_walk_state(previous_walk_state); |
1da177e4 LT |
679 | } |
680 | ||
681 | /* Normal exit */ | |
682 | ||
4be44fcd LB |
683 | acpi_ex_release_all_mutexes(thread); |
684 | acpi_ut_delete_generic_state(ACPI_CAST_PTR | |
685 | (union acpi_generic_state, thread)); | |
1da177e4 | 686 | acpi_gbl_current_walk_list = prev_walk_list; |
4be44fcd | 687 | return_ACPI_STATUS(status); |
1da177e4 | 688 | } |