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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psparse - Parser top level AML parse routines | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
c8100dc4 | 8 | * Copyright (C) 2000 - 2016, 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 |
f5c1e1c5 LZ |
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 | ||
ab6c5733 | 150 | acpi_ex_stop_trace_opcode(op, walk_state); |
a616dc2f | 151 | |
1da177e4 LT |
152 | /* Delete this op and the subtree below it if asked to */ |
153 | ||
4be44fcd LB |
154 | if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) != |
155 | ACPI_PARSE_DELETE_TREE) | |
156 | || (walk_state->op_info->class == AML_CLASS_ARGUMENT)) { | |
157 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
158 | } |
159 | ||
160 | /* Make sure that we only delete this subtree */ | |
161 | ||
162 | if (op->common.parent) { | |
88ac00f5 RM |
163 | prev = op->common.parent->common.value.arg; |
164 | if (!prev) { | |
52fc0b02 | 165 | |
88ac00f5 RM |
166 | /* Nothing more to do */ |
167 | ||
168 | goto cleanup; | |
169 | } | |
170 | ||
1da177e4 LT |
171 | /* |
172 | * Check if we need to replace the operator and its subtree | |
173 | * with a return value op (placeholder op) | |
174 | */ | |
4be44fcd LB |
175 | parent_info = |
176 | acpi_ps_get_opcode_info(op->common.parent->common. | |
177 | aml_opcode); | |
1da177e4 LT |
178 | |
179 | switch (parent_info->class) { | |
180 | case AML_CLASS_CONTROL: | |
1d1ea1b7 | 181 | |
1da177e4 LT |
182 | break; |
183 | ||
184 | case AML_CLASS_CREATE: | |
1da177e4 LT |
185 | /* |
186 | * These opcodes contain term_arg operands. The current | |
187 | * op must be replaced by a placeholder return op | |
188 | */ | |
4be44fcd | 189 | replacement_op = |
62eb935b LZ |
190 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP, |
191 | op->common.aml); | |
1da177e4 | 192 | if (!replacement_op) { |
c35def21 | 193 | status = AE_NO_MEMORY; |
1da177e4 LT |
194 | } |
195 | break; | |
196 | ||
197 | case AML_CLASS_NAMED_OBJECT: | |
1da177e4 LT |
198 | /* |
199 | * These opcodes contain term_arg operands. The current | |
200 | * op must be replaced by a placeholder return op | |
201 | */ | |
4be44fcd LB |
202 | if ((op->common.parent->common.aml_opcode == |
203 | AML_REGION_OP) | |
204 | || (op->common.parent->common.aml_opcode == | |
205 | AML_DATA_REGION_OP) | |
206 | || (op->common.parent->common.aml_opcode == | |
207 | AML_BUFFER_OP) | |
208 | || (op->common.parent->common.aml_opcode == | |
209 | AML_PACKAGE_OP) | |
ef805d95 LM |
210 | || (op->common.parent->common.aml_opcode == |
211 | AML_BANK_FIELD_OP) | |
4be44fcd LB |
212 | || (op->common.parent->common.aml_opcode == |
213 | AML_VAR_PACKAGE_OP)) { | |
214 | replacement_op = | |
62eb935b LZ |
215 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP, |
216 | op->common.aml); | |
1da177e4 | 217 | if (!replacement_op) { |
c35def21 | 218 | status = AE_NO_MEMORY; |
1da177e4 | 219 | } |
4be44fcd LB |
220 | } else |
221 | if ((op->common.parent->common.aml_opcode == | |
222 | AML_NAME_OP) | |
223 | && (walk_state->pass_number <= | |
224 | ACPI_IMODE_LOAD_PASS2)) { | |
225 | if ((op->common.aml_opcode == AML_BUFFER_OP) | |
226 | || (op->common.aml_opcode == AML_PACKAGE_OP) | |
227 | || (op->common.aml_opcode == | |
228 | AML_VAR_PACKAGE_OP)) { | |
229 | replacement_op = | |
230 | acpi_ps_alloc_op(op->common. | |
62eb935b LZ |
231 | aml_opcode, |
232 | op->common.aml); | |
1da177e4 | 233 | if (!replacement_op) { |
c35def21 LM |
234 | status = AE_NO_MEMORY; |
235 | } else { | |
236 | replacement_op->named.data = | |
237 | op->named.data; | |
238 | replacement_op->named.length = | |
239 | op->named.length; | |
1da177e4 | 240 | } |
1da177e4 LT |
241 | } |
242 | } | |
243 | break; | |
244 | ||
245 | default: | |
88ac00f5 | 246 | |
4be44fcd | 247 | replacement_op = |
62eb935b LZ |
248 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP, |
249 | op->common.aml); | |
1da177e4 | 250 | if (!replacement_op) { |
c35def21 | 251 | status = AE_NO_MEMORY; |
1da177e4 LT |
252 | } |
253 | } | |
254 | ||
255 | /* We must unlink this op from the parent tree */ | |
256 | ||
1da177e4 | 257 | if (prev == op) { |
52fc0b02 | 258 | |
1da177e4 LT |
259 | /* This op is the first in the list */ |
260 | ||
261 | if (replacement_op) { | |
4be44fcd LB |
262 | replacement_op->common.parent = |
263 | op->common.parent; | |
264 | replacement_op->common.value.arg = NULL; | |
265 | replacement_op->common.node = op->common.node; | |
266 | op->common.parent->common.value.arg = | |
267 | replacement_op; | |
268 | replacement_op->common.next = op->common.next; | |
269 | } else { | |
270 | op->common.parent->common.value.arg = | |
271 | op->common.next; | |
1da177e4 LT |
272 | } |
273 | } | |
274 | ||
275 | /* Search the parent list */ | |
276 | ||
4be44fcd LB |
277 | else |
278 | while (prev) { | |
52fc0b02 | 279 | |
4be44fcd LB |
280 | /* Traverse all siblings in the parent's argument list */ |
281 | ||
282 | next = prev->common.next; | |
283 | if (next == op) { | |
284 | if (replacement_op) { | |
285 | replacement_op->common.parent = | |
286 | op->common.parent; | |
287 | replacement_op->common.value. | |
288 | arg = NULL; | |
289 | replacement_op->common.node = | |
290 | op->common.node; | |
291 | prev->common.next = | |
292 | replacement_op; | |
293 | replacement_op->common.next = | |
294 | op->common.next; | |
295 | next = NULL; | |
296 | } else { | |
297 | prev->common.next = | |
298 | op->common.next; | |
299 | next = NULL; | |
300 | } | |
1da177e4 | 301 | } |
4be44fcd | 302 | prev = next; |
1da177e4 | 303 | } |
1da177e4 LT |
304 | } |
305 | ||
10622bf8 | 306 | cleanup: |
1da177e4 | 307 | |
44f6c012 | 308 | /* Now we can actually delete the subtree rooted at Op */ |
1da177e4 | 309 | |
4be44fcd | 310 | acpi_ps_delete_parse_tree(op); |
c35def21 | 311 | return_ACPI_STATUS(status); |
1da177e4 LT |
312 | } |
313 | ||
1da177e4 LT |
314 | /******************************************************************************* |
315 | * | |
316 | * FUNCTION: acpi_ps_next_parse_state | |
317 | * | |
44f6c012 | 318 | * PARAMETERS: walk_state - Current state |
ba494bee | 319 | * op - Current parse op |
44f6c012 | 320 | * callback_status - Status from previous operation |
1da177e4 LT |
321 | * |
322 | * RETURN: Status | |
323 | * | |
324 | * DESCRIPTION: Update the parser state based upon the return exception from | |
325 | * the parser callback. | |
326 | * | |
327 | ******************************************************************************/ | |
328 | ||
73459f73 | 329 | acpi_status |
4be44fcd LB |
330 | acpi_ps_next_parse_state(struct acpi_walk_state *walk_state, |
331 | union acpi_parse_object *op, | |
332 | acpi_status callback_status) | |
1da177e4 | 333 | { |
4be44fcd LB |
334 | struct acpi_parse_state *parser_state = &walk_state->parser_state; |
335 | acpi_status status = AE_CTRL_PENDING; | |
1da177e4 | 336 | |
b229cf92 | 337 | ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op); |
1da177e4 LT |
338 | |
339 | switch (callback_status) { | |
340 | case AE_CTRL_TERMINATE: | |
1da177e4 LT |
341 | /* |
342 | * A control method was terminated via a RETURN statement. | |
343 | * The walk of this method is complete. | |
344 | */ | |
345 | parser_state->aml = parser_state->aml_end; | |
346 | status = AE_CTRL_TERMINATE; | |
347 | break; | |
348 | ||
1da177e4 LT |
349 | case AE_CTRL_BREAK: |
350 | ||
351 | parser_state->aml = walk_state->aml_last_while; | |
352 | walk_state->control_state->common.value = FALSE; | |
773069d4 | 353 | status = AE_CTRL_BREAK; |
1da177e4 LT |
354 | break; |
355 | ||
356 | case AE_CTRL_CONTINUE: | |
357 | ||
1da177e4 | 358 | parser_state->aml = walk_state->aml_last_while; |
773069d4 | 359 | status = AE_CTRL_CONTINUE; |
1da177e4 LT |
360 | break; |
361 | ||
362 | case AE_CTRL_PENDING: | |
363 | ||
364 | parser_state->aml = walk_state->aml_last_while; | |
365 | break; | |
366 | ||
367 | #if 0 | |
368 | case AE_CTRL_SKIP: | |
369 | ||
370 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; | |
371 | status = AE_OK; | |
372 | break; | |
373 | #endif | |
374 | ||
375 | case AE_CTRL_TRUE: | |
1da177e4 LT |
376 | /* |
377 | * Predicate of an IF was true, and we are at the matching ELSE. | |
378 | * Just close out this package | |
379 | */ | |
4be44fcd | 380 | parser_state->aml = acpi_ps_get_next_package_end(parser_state); |
773069d4 | 381 | status = AE_CTRL_PENDING; |
1da177e4 LT |
382 | break; |
383 | ||
1da177e4 | 384 | case AE_CTRL_FALSE: |
1da177e4 LT |
385 | /* |
386 | * Either an IF/WHILE Predicate was false or we encountered a BREAK | |
73a3090a | 387 | * opcode. In both cases, we do not execute the rest of the |
1da177e4 LT |
388 | * package; We simply close out the parent (finishing the walk of |
389 | * this branch of the tree) and continue execution at the parent | |
390 | * level. | |
391 | */ | |
392 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; | |
393 | ||
394 | /* In the case of a BREAK, just force a predicate (if any) to FALSE */ | |
395 | ||
396 | walk_state->control_state->common.value = FALSE; | |
397 | status = AE_CTRL_END; | |
398 | break; | |
399 | ||
1da177e4 LT |
400 | case AE_CTRL_TRANSFER: |
401 | ||
44f6c012 RM |
402 | /* A method call (invocation) -- transfer control */ |
403 | ||
1da177e4 LT |
404 | status = AE_CTRL_TRANSFER; |
405 | walk_state->prev_op = op; | |
406 | walk_state->method_call_op = op; | |
4be44fcd LB |
407 | walk_state->method_call_node = |
408 | (op->common.value.arg)->common.node; | |
1da177e4 LT |
409 | |
410 | /* Will return value (if any) be used by the caller? */ | |
411 | ||
4be44fcd LB |
412 | walk_state->return_used = |
413 | acpi_ds_is_result_used(op, walk_state); | |
1da177e4 LT |
414 | break; |
415 | ||
1da177e4 | 416 | default: |
44f6c012 | 417 | |
1da177e4 LT |
418 | status = callback_status; |
419 | if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) { | |
420 | status = AE_OK; | |
421 | } | |
422 | break; | |
423 | } | |
424 | ||
4be44fcd | 425 | return_ACPI_STATUS(status); |
1da177e4 LT |
426 | } |
427 | ||
1da177e4 LT |
428 | /******************************************************************************* |
429 | * | |
430 | * FUNCTION: acpi_ps_parse_aml | |
431 | * | |
44f6c012 | 432 | * PARAMETERS: walk_state - Current state |
1da177e4 LT |
433 | * |
434 | * | |
435 | * RETURN: Status | |
436 | * | |
437 | * DESCRIPTION: Parse raw AML and return a tree of ops | |
438 | * | |
439 | ******************************************************************************/ | |
440 | ||
4be44fcd | 441 | acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state) |
1da177e4 | 442 | { |
4be44fcd | 443 | acpi_status status; |
4be44fcd LB |
444 | struct acpi_thread_state *thread; |
445 | struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list; | |
446 | struct acpi_walk_state *previous_walk_state; | |
1da177e4 | 447 | |
b229cf92 | 448 | ACPI_FUNCTION_TRACE(ps_parse_aml); |
1da177e4 | 449 | |
4be44fcd | 450 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 451 | "Entered with WalkState=%p Aml=%p size=%X\n", |
4be44fcd LB |
452 | walk_state, walk_state->parser_state.aml, |
453 | walk_state->parser_state.aml_size)); | |
1da177e4 | 454 | |
a8fadc92 BM |
455 | if (!walk_state->parser_state.aml) { |
456 | return_ACPI_STATUS(AE_NULL_OBJECT); | |
457 | } | |
458 | ||
1da177e4 LT |
459 | /* Create and initialize a new thread state */ |
460 | ||
4be44fcd | 461 | thread = acpi_ut_create_thread_state(); |
1da177e4 | 462 | if (!thread) { |
84d4db7c LM |
463 | if (walk_state->method_desc) { |
464 | ||
465 | /* Executing a control method - additional cleanup */ | |
466 | ||
1f86e8c1 LZ |
467 | acpi_ds_terminate_control_method(walk_state-> |
468 | method_desc, | |
469 | walk_state); | |
84d4db7c LM |
470 | } |
471 | ||
4119532c | 472 | acpi_ds_delete_walk_state(walk_state); |
4be44fcd | 473 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
474 | } |
475 | ||
476 | walk_state->thread = thread; | |
967440e3 BM |
477 | |
478 | /* | |
479 | * If executing a method, the starting sync_level is this method's | |
480 | * sync_level | |
481 | */ | |
482 | if (walk_state->method_desc) { | |
483 | walk_state->thread->current_sync_level = | |
484 | walk_state->method_desc->method.sync_level; | |
485 | } | |
486 | ||
4be44fcd | 487 | acpi_ds_push_walk_state(walk_state, thread); |
1da177e4 LT |
488 | |
489 | /* | |
490 | * This global allows the AML debugger to get a handle to the currently | |
491 | * executing control method. | |
492 | */ | |
493 | acpi_gbl_current_walk_list = thread; | |
494 | ||
495 | /* | |
73a3090a | 496 | * Execute the walk loop as long as there is a valid Walk State. This |
1da177e4 LT |
497 | * handles nested control method invocations without recursion. |
498 | */ | |
4be44fcd | 499 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state)); |
1da177e4 LT |
500 | |
501 | status = AE_OK; | |
502 | while (walk_state) { | |
4be44fcd | 503 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
504 | /* |
505 | * The parse_loop executes AML until the method terminates | |
506 | * or calls another method. | |
507 | */ | |
4be44fcd | 508 | status = acpi_ps_parse_loop(walk_state); |
1da177e4 LT |
509 | } |
510 | ||
4be44fcd LB |
511 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
512 | "Completed one call to walk loop, %s State=%p\n", | |
513 | acpi_format_exception(status), walk_state)); | |
1da177e4 LT |
514 | |
515 | if (status == AE_CTRL_TRANSFER) { | |
516 | /* | |
517 | * A method call was detected. | |
518 | * Transfer control to the called control method | |
519 | */ | |
4be44fcd LB |
520 | status = |
521 | acpi_ds_call_control_method(thread, walk_state, | |
522 | NULL); | |
967440e3 BM |
523 | if (ACPI_FAILURE(status)) { |
524 | status = | |
525 | acpi_ds_method_error(status, walk_state); | |
526 | } | |
1da177e4 LT |
527 | |
528 | /* | |
1fad8738 BM |
529 | * If the transfer to the new method method call worked |
530 | *, a new walk state was created -- get it | |
1da177e4 | 531 | */ |
4be44fcd | 532 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 533 | continue; |
4be44fcd | 534 | } else if (status == AE_CTRL_TERMINATE) { |
1da177e4 | 535 | status = AE_OK; |
4be44fcd | 536 | } else if ((status != AE_OK) && (walk_state->method_desc)) { |
52fc0b02 | 537 | |
c51a4de8 | 538 | /* Either the method parse or actual execution failed */ |
1da177e4 | 539 | |
441ad11d | 540 | acpi_ex_exit_interpreter(); |
b8e4d893 BM |
541 | ACPI_ERROR_METHOD("Method parse/execution failed", |
542 | walk_state->method_node, NULL, | |
543 | status); | |
441ad11d | 544 | acpi_ex_enter_interpreter(); |
aff8c277 | 545 | |
1da177e4 LT |
546 | /* Check for possible multi-thread reentrancy problem */ |
547 | ||
548 | if ((status == AE_ALREADY_EXISTS) && | |
1fad8738 BM |
549 | (!(walk_state->method_desc->method.info_flags & |
550 | ACPI_METHOD_SERIALIZED))) { | |
1da177e4 | 551 | /* |
26294842 LM |
552 | * Method is not serialized and tried to create an object |
553 | * twice. The probable cause is that the method cannot | |
554 | * handle reentrancy. Mark as "pending serialized" now, and | |
555 | * then mark "serialized" when the last thread exits. | |
1da177e4 | 556 | */ |
26294842 LM |
557 | walk_state->method_desc->method.info_flags |= |
558 | ACPI_METHOD_SERIALIZED_PENDING; | |
1da177e4 LT |
559 | } |
560 | } | |
561 | ||
1da177e4 LT |
562 | /* We are done with this walk, move on to the parent if any */ |
563 | ||
4be44fcd | 564 | walk_state = acpi_ds_pop_walk_state(thread); |
1da177e4 LT |
565 | |
566 | /* Reset the current scope to the beginning of scope stack */ | |
567 | ||
4be44fcd | 568 | acpi_ds_scope_stack_clear(walk_state); |
1da177e4 LT |
569 | |
570 | /* | |
c51a4de8 BM |
571 | * If we just returned from the execution of a control method or if we |
572 | * encountered an error during the method parse phase, there's lots of | |
573 | * cleanup to do | |
1da177e4 | 574 | */ |
c51a4de8 | 575 | if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == |
de56ba95 LZ |
576 | ACPI_PARSE_EXECUTE && |
577 | !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) || | |
578 | (ACPI_FAILURE(status))) { | |
b229cf92 BM |
579 | acpi_ds_terminate_control_method(walk_state-> |
580 | method_desc, | |
581 | walk_state); | |
1da177e4 LT |
582 | } |
583 | ||
584 | /* Delete this walk state and all linked control states */ | |
585 | ||
4be44fcd | 586 | acpi_ps_cleanup_scope(&walk_state->parser_state); |
1da177e4 LT |
587 | previous_walk_state = walk_state; |
588 | ||
4be44fcd | 589 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 590 | "ReturnValue=%p, ImplicitValue=%p State=%p\n", |
4be44fcd LB |
591 | walk_state->return_desc, |
592 | walk_state->implicit_return_obj, walk_state)); | |
1da177e4 LT |
593 | |
594 | /* Check if we have restarted a preempted walk */ | |
595 | ||
4be44fcd | 596 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 597 | if (walk_state) { |
4be44fcd | 598 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
599 | /* |
600 | * There is another walk state, restart it. | |
601 | * If the method return value is not used by the parent, | |
602 | * The object is deleted | |
603 | */ | |
604 | if (!previous_walk_state->return_desc) { | |
9accd464 LM |
605 | /* |
606 | * In slack mode execution, if there is no return value | |
607 | * we should implicitly return zero (0) as a default value. | |
608 | */ | |
609 | if (acpi_gbl_enable_interpreter_slack && | |
610 | !previous_walk_state-> | |
611 | implicit_return_obj) { | |
612 | previous_walk_state-> | |
613 | implicit_return_obj = | |
dc95a270 BM |
614 | acpi_ut_create_integer_object |
615 | ((u64) 0); | |
9accd464 LM |
616 | if (!previous_walk_state-> |
617 | implicit_return_obj) { | |
618 | return_ACPI_STATUS | |
619 | (AE_NO_MEMORY); | |
620 | } | |
9accd464 LM |
621 | } |
622 | ||
623 | /* Restart the calling control method */ | |
624 | ||
4be44fcd LB |
625 | status = |
626 | acpi_ds_restart_control_method | |
627 | (walk_state, | |
628 | previous_walk_state-> | |
629 | implicit_return_obj); | |
630 | } else { | |
1da177e4 LT |
631 | /* |
632 | * We have a valid return value, delete any implicit | |
633 | * return value. | |
634 | */ | |
4be44fcd LB |
635 | acpi_ds_clear_implicit_return |
636 | (previous_walk_state); | |
1da177e4 | 637 | |
4be44fcd LB |
638 | status = |
639 | acpi_ds_restart_control_method | |
640 | (walk_state, | |
641 | previous_walk_state->return_desc); | |
1da177e4 | 642 | } |
4be44fcd LB |
643 | if (ACPI_SUCCESS(status)) { |
644 | walk_state->walk_type |= | |
645 | ACPI_WALK_METHOD_RESTART; | |
1da177e4 | 646 | } |
4be44fcd | 647 | } else { |
d8a0ec91 | 648 | /* On error, delete any return object or implicit return */ |
1da177e4 | 649 | |
4be44fcd LB |
650 | acpi_ut_remove_reference(previous_walk_state-> |
651 | return_desc); | |
d8a0ec91 LM |
652 | acpi_ds_clear_implicit_return |
653 | (previous_walk_state); | |
1da177e4 LT |
654 | } |
655 | } | |
656 | ||
657 | /* | |
658 | * Just completed a 1st-level method, save the final internal return | |
659 | * value (if any) | |
660 | */ | |
661 | else if (previous_walk_state->caller_return_desc) { | |
662 | if (previous_walk_state->implicit_return_obj) { | |
44f6c012 | 663 | *(previous_walk_state->caller_return_desc) = |
4be44fcd LB |
664 | previous_walk_state->implicit_return_obj; |
665 | } else { | |
666 | /* NULL if no return value */ | |
1da177e4 | 667 | |
44f6c012 | 668 | *(previous_walk_state->caller_return_desc) = |
4be44fcd | 669 | previous_walk_state->return_desc; |
1da177e4 | 670 | } |
4be44fcd | 671 | } else { |
1da177e4 | 672 | if (previous_walk_state->return_desc) { |
52fc0b02 | 673 | |
1da177e4 LT |
674 | /* Caller doesn't want it, must delete it */ |
675 | ||
4be44fcd LB |
676 | acpi_ut_remove_reference(previous_walk_state-> |
677 | return_desc); | |
1da177e4 LT |
678 | } |
679 | if (previous_walk_state->implicit_return_obj) { | |
52fc0b02 | 680 | |
1da177e4 LT |
681 | /* Caller doesn't want it, must delete it */ |
682 | ||
4be44fcd LB |
683 | acpi_ut_remove_reference(previous_walk_state-> |
684 | implicit_return_obj); | |
1da177e4 LT |
685 | } |
686 | } | |
687 | ||
4be44fcd | 688 | acpi_ds_delete_walk_state(previous_walk_state); |
1da177e4 LT |
689 | } |
690 | ||
691 | /* Normal exit */ | |
692 | ||
4be44fcd LB |
693 | acpi_ex_release_all_mutexes(thread); |
694 | acpi_ut_delete_generic_state(ACPI_CAST_PTR | |
695 | (union acpi_generic_state, thread)); | |
1da177e4 | 696 | acpi_gbl_current_walk_list = prev_walk_list; |
4be44fcd | 697 | return_ACPI_STATUS(status); |
1da177e4 | 698 | } |