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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psparse - Parser top level AML parse routines | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
6c9deb72 | 8 | * Copyright (C) 2000 - 2007, R. Byron Moore |
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, | |
46 | * like Perl, do. Parsing is done by hand rather than with a YACC | |
47 | * generated parser to tightly constrain stack and dynamic memory | |
48 | * usage. At the same time, parsing is kept flexible and the code | |
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> | |
54 | #include <acpi/acparser.h> | |
55 | #include <acpi/acdispat.h> | |
56 | #include <acpi/amlcode.h> | |
57 | #include <acpi/acnamesp.h> | |
58 | #include <acpi/acinterp.h> | |
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 | * | |
67 | * PARAMETERS: Opcode - An AML opcode | |
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 | |
124 | * Op - Op to complete | |
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; | |
1da177e4 | 140 | |
b229cf92 | 141 | ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op); |
1da177e4 LT |
142 | |
143 | /* Check for null Op, can happen if AML code is corrupt */ | |
144 | ||
145 | if (!op) { | |
4be44fcd | 146 | return_ACPI_STATUS(AE_OK); /* OK for now */ |
1da177e4 LT |
147 | } |
148 | ||
149 | /* Delete this op and the subtree below it if asked to */ | |
150 | ||
4be44fcd LB |
151 | if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) != |
152 | ACPI_PARSE_DELETE_TREE) | |
153 | || (walk_state->op_info->class == AML_CLASS_ARGUMENT)) { | |
154 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
155 | } |
156 | ||
157 | /* Make sure that we only delete this subtree */ | |
158 | ||
159 | if (op->common.parent) { | |
88ac00f5 RM |
160 | prev = op->common.parent->common.value.arg; |
161 | if (!prev) { | |
52fc0b02 | 162 | |
88ac00f5 RM |
163 | /* Nothing more to do */ |
164 | ||
165 | goto cleanup; | |
166 | } | |
167 | ||
1da177e4 LT |
168 | /* |
169 | * Check if we need to replace the operator and its subtree | |
170 | * with a return value op (placeholder op) | |
171 | */ | |
4be44fcd LB |
172 | parent_info = |
173 | acpi_ps_get_opcode_info(op->common.parent->common. | |
174 | aml_opcode); | |
1da177e4 LT |
175 | |
176 | switch (parent_info->class) { | |
177 | case AML_CLASS_CONTROL: | |
178 | break; | |
179 | ||
180 | case AML_CLASS_CREATE: | |
181 | ||
182 | /* | |
183 | * These opcodes contain term_arg operands. The current | |
184 | * op must be replaced by a placeholder return op | |
185 | */ | |
4be44fcd LB |
186 | replacement_op = |
187 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); | |
1da177e4 | 188 | if (!replacement_op) { |
88ac00f5 | 189 | goto allocate_error; |
1da177e4 LT |
190 | } |
191 | break; | |
192 | ||
193 | case AML_CLASS_NAMED_OBJECT: | |
194 | ||
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) { |
88ac00f5 | 214 | goto allocate_error; |
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) { |
88ac00f5 | 229 | goto allocate_error; |
1da177e4 LT |
230 | } |
231 | ||
4be44fcd LB |
232 | replacement_op->named.data = |
233 | op->named.data; | |
234 | replacement_op->named.length = | |
235 | op->named.length; | |
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) { |
88ac00f5 | 245 | goto allocate_error; |
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 | ||
4be44fcd | 300 | cleanup: |
1da177e4 | 301 | |
44f6c012 | 302 | /* Now we can actually delete the subtree rooted at Op */ |
1da177e4 | 303 | |
4be44fcd LB |
304 | acpi_ps_delete_parse_tree(op); |
305 | return_ACPI_STATUS(AE_OK); | |
88ac00f5 | 306 | |
4be44fcd | 307 | allocate_error: |
88ac00f5 RM |
308 | |
309 | /* Always delete the subtree, even on error */ | |
310 | ||
4be44fcd LB |
311 | acpi_ps_delete_parse_tree(op); |
312 | return_ACPI_STATUS(AE_NO_MEMORY); | |
1da177e4 LT |
313 | } |
314 | ||
1da177e4 LT |
315 | /******************************************************************************* |
316 | * | |
317 | * FUNCTION: acpi_ps_next_parse_state | |
318 | * | |
44f6c012 RM |
319 | * PARAMETERS: walk_state - Current state |
320 | * Op - Current parse op | |
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 | |
388 | * opcode. In both cases, we do not execute the rest of the | |
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 LT |
455 | |
456 | /* Create and initialize a new thread state */ | |
457 | ||
4be44fcd | 458 | thread = acpi_ut_create_thread_state(); |
1da177e4 | 459 | if (!thread) { |
4119532c | 460 | acpi_ds_delete_walk_state(walk_state); |
4be44fcd | 461 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
462 | } |
463 | ||
464 | walk_state->thread = thread; | |
967440e3 BM |
465 | |
466 | /* | |
467 | * If executing a method, the starting sync_level is this method's | |
468 | * sync_level | |
469 | */ | |
470 | if (walk_state->method_desc) { | |
471 | walk_state->thread->current_sync_level = | |
472 | walk_state->method_desc->method.sync_level; | |
473 | } | |
474 | ||
4be44fcd | 475 | acpi_ds_push_walk_state(walk_state, thread); |
1da177e4 LT |
476 | |
477 | /* | |
478 | * This global allows the AML debugger to get a handle to the currently | |
479 | * executing control method. | |
480 | */ | |
481 | acpi_gbl_current_walk_list = thread; | |
482 | ||
483 | /* | |
484 | * Execute the walk loop as long as there is a valid Walk State. This | |
485 | * handles nested control method invocations without recursion. | |
486 | */ | |
4be44fcd | 487 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state)); |
1da177e4 LT |
488 | |
489 | status = AE_OK; | |
490 | while (walk_state) { | |
4be44fcd | 491 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
492 | /* |
493 | * The parse_loop executes AML until the method terminates | |
494 | * or calls another method. | |
495 | */ | |
4be44fcd | 496 | status = acpi_ps_parse_loop(walk_state); |
1da177e4 LT |
497 | } |
498 | ||
4be44fcd LB |
499 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
500 | "Completed one call to walk loop, %s State=%p\n", | |
501 | acpi_format_exception(status), walk_state)); | |
1da177e4 LT |
502 | |
503 | if (status == AE_CTRL_TRANSFER) { | |
504 | /* | |
505 | * A method call was detected. | |
506 | * Transfer control to the called control method | |
507 | */ | |
4be44fcd LB |
508 | status = |
509 | acpi_ds_call_control_method(thread, walk_state, | |
510 | NULL); | |
967440e3 BM |
511 | if (ACPI_FAILURE(status)) { |
512 | status = | |
513 | acpi_ds_method_error(status, walk_state); | |
514 | } | |
1da177e4 LT |
515 | |
516 | /* | |
517 | * If the transfer to the new method method call worked, a new walk | |
518 | * state was created -- get it | |
519 | */ | |
4be44fcd | 520 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 521 | continue; |
4be44fcd | 522 | } else if (status == AE_CTRL_TERMINATE) { |
1da177e4 | 523 | status = AE_OK; |
4be44fcd | 524 | } else if ((status != AE_OK) && (walk_state->method_desc)) { |
52fc0b02 | 525 | |
c51a4de8 | 526 | /* Either the method parse or actual execution failed */ |
1da177e4 | 527 | |
b8e4d893 BM |
528 | ACPI_ERROR_METHOD("Method parse/execution failed", |
529 | walk_state->method_node, NULL, | |
530 | status); | |
aff8c277 | 531 | |
1da177e4 LT |
532 | /* Check for possible multi-thread reentrancy problem */ |
533 | ||
534 | if ((status == AE_ALREADY_EXISTS) && | |
967440e3 | 535 | (!walk_state->method_desc->method.mutex)) { |
13b572a3 | 536 | ACPI_INFO((AE_INFO, |
6deb65dd | 537 | "Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error", |
13b572a3 BM |
538 | walk_state->method_node->name. |
539 | ascii)); | |
540 | ||
1da177e4 | 541 | /* |
c51a4de8 BM |
542 | * Method tried to create an object twice. The probable cause is |
543 | * that the method cannot handle reentrancy. | |
544 | * | |
545 | * The method is marked not_serialized, but it tried to create | |
44f6c012 | 546 | * a named object, causing the second thread entrance to fail. |
c51a4de8 | 547 | * Workaround this problem by marking the method permanently |
44f6c012 | 548 | * as Serialized. |
1da177e4 | 549 | */ |
4be44fcd LB |
550 | walk_state->method_desc->method.method_flags |= |
551 | AML_METHOD_SERIALIZED; | |
967440e3 | 552 | walk_state->method_desc->method.sync_level = 0; |
1da177e4 LT |
553 | } |
554 | } | |
555 | ||
1da177e4 LT |
556 | /* We are done with this walk, move on to the parent if any */ |
557 | ||
4be44fcd | 558 | walk_state = acpi_ds_pop_walk_state(thread); |
1da177e4 LT |
559 | |
560 | /* Reset the current scope to the beginning of scope stack */ | |
561 | ||
4be44fcd | 562 | acpi_ds_scope_stack_clear(walk_state); |
1da177e4 LT |
563 | |
564 | /* | |
c51a4de8 BM |
565 | * If we just returned from the execution of a control method or if we |
566 | * encountered an error during the method parse phase, there's lots of | |
567 | * cleanup to do | |
1da177e4 | 568 | */ |
c51a4de8 BM |
569 | if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == |
570 | ACPI_PARSE_EXECUTE) || (ACPI_FAILURE(status))) { | |
b229cf92 BM |
571 | acpi_ds_terminate_control_method(walk_state-> |
572 | method_desc, | |
573 | walk_state); | |
1da177e4 LT |
574 | } |
575 | ||
576 | /* Delete this walk state and all linked control states */ | |
577 | ||
4be44fcd | 578 | acpi_ps_cleanup_scope(&walk_state->parser_state); |
1da177e4 LT |
579 | previous_walk_state = walk_state; |
580 | ||
4be44fcd | 581 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 582 | "ReturnValue=%p, ImplicitValue=%p State=%p\n", |
4be44fcd LB |
583 | walk_state->return_desc, |
584 | walk_state->implicit_return_obj, walk_state)); | |
1da177e4 LT |
585 | |
586 | /* Check if we have restarted a preempted walk */ | |
587 | ||
4be44fcd | 588 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 589 | if (walk_state) { |
4be44fcd | 590 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
591 | /* |
592 | * There is another walk state, restart it. | |
593 | * If the method return value is not used by the parent, | |
594 | * The object is deleted | |
595 | */ | |
596 | if (!previous_walk_state->return_desc) { | |
9accd464 LM |
597 | /* |
598 | * In slack mode execution, if there is no return value | |
599 | * we should implicitly return zero (0) as a default value. | |
600 | */ | |
601 | if (acpi_gbl_enable_interpreter_slack && | |
602 | !previous_walk_state-> | |
603 | implicit_return_obj) { | |
604 | previous_walk_state-> | |
605 | implicit_return_obj = | |
606 | acpi_ut_create_internal_object | |
607 | (ACPI_TYPE_INTEGER); | |
608 | if (!previous_walk_state-> | |
609 | implicit_return_obj) { | |
610 | return_ACPI_STATUS | |
611 | (AE_NO_MEMORY); | |
612 | } | |
613 | ||
614 | previous_walk_state-> | |
615 | implicit_return_obj-> | |
616 | integer.value = 0; | |
617 | } | |
618 | ||
619 | /* Restart the calling control method */ | |
620 | ||
4be44fcd LB |
621 | status = |
622 | acpi_ds_restart_control_method | |
623 | (walk_state, | |
624 | previous_walk_state-> | |
625 | implicit_return_obj); | |
626 | } else { | |
1da177e4 LT |
627 | /* |
628 | * We have a valid return value, delete any implicit | |
629 | * return value. | |
630 | */ | |
4be44fcd LB |
631 | acpi_ds_clear_implicit_return |
632 | (previous_walk_state); | |
1da177e4 | 633 | |
4be44fcd LB |
634 | status = |
635 | acpi_ds_restart_control_method | |
636 | (walk_state, | |
637 | previous_walk_state->return_desc); | |
1da177e4 | 638 | } |
4be44fcd LB |
639 | if (ACPI_SUCCESS(status)) { |
640 | walk_state->walk_type |= | |
641 | ACPI_WALK_METHOD_RESTART; | |
1da177e4 | 642 | } |
4be44fcd | 643 | } else { |
1da177e4 LT |
644 | /* On error, delete any return object */ |
645 | ||
4be44fcd LB |
646 | acpi_ut_remove_reference(previous_walk_state-> |
647 | return_desc); | |
1da177e4 LT |
648 | } |
649 | } | |
650 | ||
651 | /* | |
652 | * Just completed a 1st-level method, save the final internal return | |
653 | * value (if any) | |
654 | */ | |
655 | else if (previous_walk_state->caller_return_desc) { | |
656 | if (previous_walk_state->implicit_return_obj) { | |
44f6c012 | 657 | *(previous_walk_state->caller_return_desc) = |
4be44fcd LB |
658 | previous_walk_state->implicit_return_obj; |
659 | } else { | |
660 | /* NULL if no return value */ | |
1da177e4 | 661 | |
44f6c012 | 662 | *(previous_walk_state->caller_return_desc) = |
4be44fcd | 663 | previous_walk_state->return_desc; |
1da177e4 | 664 | } |
4be44fcd | 665 | } else { |
1da177e4 | 666 | if (previous_walk_state->return_desc) { |
52fc0b02 | 667 | |
1da177e4 LT |
668 | /* Caller doesn't want it, must delete it */ |
669 | ||
4be44fcd LB |
670 | acpi_ut_remove_reference(previous_walk_state-> |
671 | return_desc); | |
1da177e4 LT |
672 | } |
673 | if (previous_walk_state->implicit_return_obj) { | |
52fc0b02 | 674 | |
1da177e4 LT |
675 | /* Caller doesn't want it, must delete it */ |
676 | ||
4be44fcd LB |
677 | acpi_ut_remove_reference(previous_walk_state-> |
678 | implicit_return_obj); | |
1da177e4 LT |
679 | } |
680 | } | |
681 | ||
4be44fcd | 682 | acpi_ds_delete_walk_state(previous_walk_state); |
1da177e4 LT |
683 | } |
684 | ||
685 | /* Normal exit */ | |
686 | ||
4be44fcd LB |
687 | acpi_ex_release_all_mutexes(thread); |
688 | acpi_ut_delete_generic_state(ACPI_CAST_PTR | |
689 | (union acpi_generic_state, thread)); | |
1da177e4 | 690 | acpi_gbl_current_walk_list = prev_walk_list; |
4be44fcd | 691 | return_ACPI_STATUS(status); |
1da177e4 | 692 | } |