1 /******************************************************************************
3 * Module Name: psloop - Main AML parse loop
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2005, R. Byron Moore
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12 * modification, are permitted provided that the following conditions
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20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
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46 * Parse the AML and build an operation tree as most interpreters,
47 * like Perl, do. Parsing is done by hand rather than with a YACC
48 * generated parser to tightly constrain stack and dynamic memory
49 * usage. At the same time, parsing is kept flexible and the code
50 * fairly compact by parsing based on a list of AML opcode
51 * templates in aml_op_info[]
54 #include <acpi/acpi.h>
55 #include <acpi/acparser.h>
56 #include <acpi/acdispat.h>
57 #include <acpi/amlcode.h>
58 #include <acpi/acnamesp.h>
59 #include <acpi/acinterp.h>
61 #define _COMPONENT ACPI_PARSER
62 ACPI_MODULE_NAME ("psloop")
64 static u32 acpi_gbl_depth = 0;
67 /*******************************************************************************
69 * FUNCTION: acpi_ps_parse_loop
71 * PARAMETERS: walk_state - Current state
75 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
78 ******************************************************************************/
82 struct acpi_walk_state *walk_state)
84 acpi_status status = AE_OK;
86 union acpi_parse_object *op = NULL; /* current op */
87 union acpi_parse_object *arg = NULL;
88 union acpi_parse_object *pre_op = NULL;
89 struct acpi_parse_state *parser_state;
90 u8 *aml_op_start = NULL;
93 ACPI_FUNCTION_TRACE_PTR ("ps_parse_loop", walk_state);
95 if (walk_state->descending_callback == NULL) {
96 return_ACPI_STATUS (AE_BAD_PARAMETER);
99 parser_state = &walk_state->parser_state;
100 walk_state->arg_types = 0;
102 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
104 if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
105 /* We are restarting a preempted control method */
107 if (acpi_ps_has_completed_scope (parser_state)) {
109 * We must check if a predicate to an IF or WHILE statement
112 if ((parser_state->scope->parse_scope.op) &&
113 ((parser_state->scope->parse_scope.op->common.aml_opcode == AML_IF_OP) ||
114 (parser_state->scope->parse_scope.op->common.aml_opcode == AML_WHILE_OP)) &&
115 (walk_state->control_state) &&
116 (walk_state->control_state->common.state ==
117 ACPI_CONTROL_PREDICATE_EXECUTING)) {
119 * A predicate was just completed, get the value of the
120 * predicate and branch based on that value
122 walk_state->op = NULL;
123 status = acpi_ds_get_predicate_value (walk_state, ACPI_TO_POINTER (TRUE));
124 if (ACPI_FAILURE (status) &&
125 ((status & AE_CODE_MASK) != AE_CODE_CONTROL)) {
126 if (status == AE_AML_NO_RETURN_VALUE) {
127 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
128 "Invoked method did not return a value, %s\n",
129 acpi_format_exception (status)));
132 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
133 "get_predicate Failed, %s\n",
134 acpi_format_exception (status)));
135 return_ACPI_STATUS (status);
138 status = acpi_ps_next_parse_state (walk_state, op, status);
141 acpi_ps_pop_scope (parser_state, &op,
142 &walk_state->arg_types, &walk_state->arg_count);
143 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op));
145 else if (walk_state->prev_op) {
146 /* We were in the middle of an op */
148 op = walk_state->prev_op;
149 walk_state->arg_types = walk_state->prev_arg_types;
154 /* Iterative parsing loop, while there is more AML to process: */
156 while ((parser_state->aml < parser_state->aml_end) || (op)) {
157 aml_op_start = parser_state->aml;
159 /* Get the next opcode from the AML stream */
161 walk_state->aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml,
162 parser_state->aml_start);
163 walk_state->opcode = acpi_ps_peek_opcode (parser_state);
166 * First cut to determine what we have found:
167 * 1) A valid AML opcode
169 * 3) An unknown/invalid opcode
171 walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode);
172 switch (walk_state->op_info->class) {
173 case AML_CLASS_ASCII:
174 case AML_CLASS_PREFIX:
176 * Starts with a valid prefix or ASCII char, this is a name
177 * string. Convert the bare name string to a namepath.
179 walk_state->opcode = AML_INT_NAMEPATH_OP;
180 walk_state->arg_types = ARGP_NAMESTRING;
183 case AML_CLASS_UNKNOWN:
185 /* The opcode is unrecognized. Just skip unknown opcodes */
187 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
188 "Found unknown opcode %X at AML address %p offset %X, ignoring\n",
189 walk_state->opcode, parser_state->aml, walk_state->aml_offset));
191 ACPI_DUMP_BUFFER (parser_state->aml, 128);
193 /* Assume one-byte bad opcode */
200 /* Found opcode info, this is a normal opcode */
202 parser_state->aml += acpi_ps_get_opcode_size (walk_state->opcode);
203 walk_state->arg_types = walk_state->op_info->parse_args;
207 /* Create Op structure and append to parent's argument list */
209 if (walk_state->op_info->flags & AML_NAMED) {
210 /* Allocate a new pre_op if necessary */
213 pre_op = acpi_ps_alloc_op (walk_state->opcode);
215 status = AE_NO_MEMORY;
220 pre_op->common.value.arg = NULL;
221 pre_op->common.aml_opcode = walk_state->opcode;
224 * Get and append arguments until we find the node that contains
225 * the name (the type ARGP_NAME).
227 while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) &&
228 (GET_CURRENT_ARG_TYPE (walk_state->arg_types) != ARGP_NAME)) {
229 status = acpi_ps_get_next_arg (walk_state, parser_state,
230 GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg);
231 if (ACPI_FAILURE (status)) {
235 acpi_ps_append_arg (pre_op, arg);
236 INCREMENT_ARG_LIST (walk_state->arg_types);
240 * Make sure that we found a NAME and didn't run out of
243 if (!GET_CURRENT_ARG_TYPE (walk_state->arg_types)) {
244 status = AE_AML_NO_OPERAND;
248 /* We know that this arg is a name, move to next arg */
250 INCREMENT_ARG_LIST (walk_state->arg_types);
253 * Find the object. This will either insert the object into
254 * the namespace or simply look it up
256 walk_state->op = NULL;
258 status = walk_state->descending_callback (walk_state, &op);
259 if (ACPI_FAILURE (status)) {
260 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
261 "During name lookup/catalog, %s\n",
262 acpi_format_exception (status)));
270 status = acpi_ps_next_parse_state (walk_state, op, status);
271 if (status == AE_CTRL_PENDING) {
276 if (ACPI_FAILURE (status)) {
280 acpi_ps_append_arg (op, pre_op->common.value.arg);
283 if (op->common.aml_opcode == AML_REGION_OP) {
285 * Defer final parsing of an operation_region body,
286 * because we don't have enough info in the first pass
287 * to parse it correctly (i.e., there may be method
288 * calls within the term_arg elements of the body.)
290 * However, we must continue parsing because
291 * the opregion is not a standalone package --
292 * we don't know where the end is at this point.
294 * (Length is unknown until parse of the body complete)
296 op->named.data = aml_op_start;
297 op->named.length = 0;
301 /* Not a named opcode, just allocate Op and append to parent */
303 walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode);
304 op = acpi_ps_alloc_op (walk_state->opcode);
306 status = AE_NO_MEMORY;
310 if (walk_state->op_info->flags & AML_CREATE) {
312 * Backup to beginning of create_xXXfield declaration
313 * body_length is unknown until we parse the body
315 op->named.data = aml_op_start;
316 op->named.length = 0;
319 acpi_ps_append_arg (acpi_ps_get_parent_scope (parser_state), op);
321 if ((walk_state->descending_callback != NULL)) {
323 * Find the object. This will either insert the object into
324 * the namespace or simply look it up
328 status = walk_state->descending_callback (walk_state, &op);
329 status = acpi_ps_next_parse_state (walk_state, op, status);
330 if (status == AE_CTRL_PENDING) {
335 if (ACPI_FAILURE (status)) {
341 op->common.aml_offset = walk_state->aml_offset;
343 if (walk_state->op_info) {
344 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
345 "Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n",
346 (u32) op->common.aml_opcode, walk_state->op_info->name,
347 op, parser_state->aml, op->common.aml_offset));
353 * Start arg_count at zero because we don't know if there are
356 walk_state->arg_count = 0;
358 /* Are there any arguments that must be processed? */
360 if (walk_state->arg_types) {
363 switch (op->common.aml_opcode) {
364 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
365 case AML_WORD_OP: /* AML_WORDDATA_ARG */
366 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
367 case AML_QWORD_OP: /* AML_QWORDATA_ARG */
368 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
370 /* Fill in constant or string argument directly */
372 acpi_ps_get_next_simple_arg (parser_state,
373 GET_CURRENT_ARG_TYPE (walk_state->arg_types), op);
376 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
378 status = acpi_ps_get_next_namepath (walk_state, parser_state, op, 1);
379 if (ACPI_FAILURE (status)) {
383 walk_state->arg_types = 0;
388 * Op is not a constant or string, append each argument
391 while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) &&
392 !walk_state->arg_count) {
393 walk_state->aml_offset = (u32)
394 ACPI_PTR_DIFF (parser_state->aml, parser_state->aml_start);
396 status = acpi_ps_get_next_arg (walk_state, parser_state,
397 GET_CURRENT_ARG_TYPE (walk_state->arg_types),
399 if (ACPI_FAILURE (status)) {
404 arg->common.aml_offset = walk_state->aml_offset;
405 acpi_ps_append_arg (op, arg);
407 INCREMENT_ARG_LIST (walk_state->arg_types);
410 /* Special processing for certain opcodes */
412 if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS1) &&
413 ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
415 * We want to skip If/Else/While constructs during Pass1
416 * because we want to actually conditionally execute the
419 * Except for disassembly, where we always want to
420 * walk the If/Else/While packages
422 switch (op->common.aml_opcode) {
427 /* Skip body of if/else/while in pass 1 */
429 parser_state->aml = parser_state->pkg_end;
430 walk_state->arg_count = 0;
438 switch (op->common.aml_opcode) {
442 * Skip parsing of control method
443 * because we don't have enough info in the first pass
444 * to parse it correctly.
446 * Save the length and address of the body
448 op->named.data = parser_state->aml;
449 op->named.length = (u32) (parser_state->pkg_end -
452 /* Skip body of method */
454 parser_state->aml = parser_state->pkg_end;
455 walk_state->arg_count = 0;
460 case AML_VAR_PACKAGE_OP:
462 if ((op->common.parent) &&
463 (op->common.parent->common.aml_opcode == AML_NAME_OP) &&
464 (walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2)) {
466 * Skip parsing of Buffers and Packages
467 * because we don't have enough info in the first pass
468 * to parse them correctly.
470 op->named.data = aml_op_start;
471 op->named.length = (u32) (parser_state->pkg_end -
476 parser_state->aml = parser_state->pkg_end;
477 walk_state->arg_count = 0;
483 if (walk_state->control_state) {
484 walk_state->control_state->control.package_end =
485 parser_state->pkg_end;
491 /* No action for all other opcodes */
498 /* Check for arguments that need to be processed */
500 if (walk_state->arg_count) {
502 * There are arguments (complex ones), push Op and
503 * prepare for argument
505 status = acpi_ps_push_scope (parser_state, op,
506 walk_state->arg_types, walk_state->arg_count);
507 if (ACPI_FAILURE (status)) {
515 * All arguments have been processed -- Op is complete,
518 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
519 if (walk_state->op_info->flags & AML_NAMED) {
520 if (acpi_gbl_depth) {
524 if (op->common.aml_opcode == AML_REGION_OP) {
526 * Skip parsing of control method or opregion body,
527 * because we don't have enough info in the first pass
528 * to parse them correctly.
530 * Completed parsing an op_region declaration, we now
533 op->named.length = (u32) (parser_state->aml - op->named.data);
537 if (walk_state->op_info->flags & AML_CREATE) {
539 * Backup to beginning of create_xXXfield declaration (1 for
542 * body_length is unknown until we parse the body
544 op->named.length = (u32) (parser_state->aml - op->named.data);
547 /* This op complete, notify the dispatcher */
549 if (walk_state->ascending_callback != NULL) {
551 walk_state->opcode = op->common.aml_opcode;
553 status = walk_state->ascending_callback (walk_state);
554 status = acpi_ps_next_parse_state (walk_state, op, status);
555 if (status == AE_CTRL_PENDING) {
564 * Finished one argument of the containing scope
566 parser_state->scope->parse_scope.arg_count--;
568 /* Finished with pre_op */
571 acpi_ps_free_op (pre_op);
575 /* Close this Op (will result in parse subtree deletion) */
577 status2 = acpi_ps_complete_this_op (walk_state, op);
578 if (ACPI_FAILURE (status2)) {
579 return_ACPI_STATUS (status2);
588 case AE_CTRL_TRANSFER:
590 /* We are about to transfer to a called method. */
592 walk_state->prev_op = op;
593 walk_state->prev_arg_types = walk_state->arg_types;
594 return_ACPI_STATUS (status);
599 acpi_ps_pop_scope (parser_state, &op,
600 &walk_state->arg_types, &walk_state->arg_count);
604 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
605 walk_state->opcode = op->common.aml_opcode;
607 status = walk_state->ascending_callback (walk_state);
608 status = acpi_ps_next_parse_state (walk_state, op, status);
610 status2 = acpi_ps_complete_this_op (walk_state, op);
611 if (ACPI_FAILURE (status2)) {
612 return_ACPI_STATUS (status2);
621 case AE_CTRL_CONTINUE:
623 /* Pop off scopes until we find the While */
625 while (!op || (op->common.aml_opcode != AML_WHILE_OP)) {
626 acpi_ps_pop_scope (parser_state, &op,
627 &walk_state->arg_types, &walk_state->arg_count);
630 /* Close this iteration of the While loop */
633 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
634 walk_state->opcode = op->common.aml_opcode;
636 status = walk_state->ascending_callback (walk_state);
637 status = acpi_ps_next_parse_state (walk_state, op, status);
639 status2 = acpi_ps_complete_this_op (walk_state, op);
640 if (ACPI_FAILURE (status2)) {
641 return_ACPI_STATUS (status2);
649 case AE_CTRL_TERMINATE:
656 status2 = acpi_ps_complete_this_op (walk_state, op);
657 if (ACPI_FAILURE (status2)) {
658 return_ACPI_STATUS (status2);
661 acpi_ps_pop_scope (parser_state, &op,
662 &walk_state->arg_types, &walk_state->arg_count);
666 return_ACPI_STATUS (status);
669 default: /* All other non-AE_OK status */
673 status2 = acpi_ps_complete_this_op (walk_state, op);
674 if (ACPI_FAILURE (status2)) {
675 return_ACPI_STATUS (status2);
678 acpi_ps_pop_scope (parser_state, &op,
679 &walk_state->arg_types, &walk_state->arg_count);
685 * TBD: Cleanup parse ops on error
689 acpi_ps_pop_scope (parser_state, &op,
690 &walk_state->arg_types, &walk_state->arg_count);
693 walk_state->prev_op = op;
694 walk_state->prev_arg_types = walk_state->arg_types;
695 return_ACPI_STATUS (status);
698 /* This scope complete? */
700 if (acpi_ps_has_completed_scope (parser_state)) {
701 acpi_ps_pop_scope (parser_state, &op,
702 &walk_state->arg_types, &walk_state->arg_count);
703 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op));
709 } /* while parser_state->Aml */
713 * Complete the last Op (if not completed), and clear the scope stack.
714 * It is easily possible to end an AML "package" with an unbounded number
715 * of open scopes (such as when several ASL blocks are closed with
716 * sequential closing braces). We want to terminate each one cleanly.
718 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "AML package complete at Op %p\n", op));
721 if (walk_state->ascending_callback != NULL) {
723 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
724 walk_state->opcode = op->common.aml_opcode;
726 status = walk_state->ascending_callback (walk_state);
727 status = acpi_ps_next_parse_state (walk_state, op, status);
728 if (status == AE_CTRL_PENDING) {
733 if (status == AE_CTRL_TERMINATE) {
739 status2 = acpi_ps_complete_this_op (walk_state, op);
740 if (ACPI_FAILURE (status2)) {
741 return_ACPI_STATUS (status2);
745 acpi_ps_pop_scope (parser_state, &op,
746 &walk_state->arg_types, &walk_state->arg_count);
750 return_ACPI_STATUS (status);
753 else if (ACPI_FAILURE (status)) {
754 /* First error is most important */
756 (void) acpi_ps_complete_this_op (walk_state, op);
757 return_ACPI_STATUS (status);
761 status2 = acpi_ps_complete_this_op (walk_state, op);
762 if (ACPI_FAILURE (status2)) {
763 return_ACPI_STATUS (status2);
767 acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types,
768 &walk_state->arg_count);
772 return_ACPI_STATUS (status);