0,0 → 1,694 |
/****************************************************************************** |
* |
* Module Name: psparse - Parser top level AML parse routines |
* |
*****************************************************************************/ |
|
/* |
* Copyright (C) 2000 - 2015, Intel Corp. |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* 1. Redistributions of source code must retain the above copyright |
* notice, this list of conditions, and the following disclaimer, |
* without modification. |
* 2. Redistributions in binary form must reproduce at minimum a disclaimer |
* substantially similar to the "NO WARRANTY" disclaimer below |
* ("Disclaimer") and any redistribution must be conditioned upon |
* including a substantially similar Disclaimer requirement for further |
* binary redistribution. |
* 3. Neither the names of the above-listed copyright holders nor the names |
* of any contributors may be used to endorse or promote products derived |
* from this software without specific prior written permission. |
* |
* Alternatively, this software may be distributed under the terms of the |
* GNU General Public License ("GPL") version 2 as published by the Free |
* Software Foundation. |
* |
* NO WARRANTY |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
* POSSIBILITY OF SUCH DAMAGES. |
*/ |
|
/* |
* Parse the AML and build an operation tree as most interpreters, |
* like Perl, do. Parsing is done by hand rather than with a YACC |
* generated parser to tightly constrain stack and dynamic memory |
* usage. At the same time, parsing is kept flexible and the code |
* fairly compact by parsing based on a list of AML opcode |
* templates in aml_op_info[] |
*/ |
|
#include <acpi/acpi.h> |
#include "accommon.h" |
#include "acparser.h" |
#include "acdispat.h" |
#include "amlcode.h" |
#include "acinterp.h" |
|
#define _COMPONENT ACPI_PARSER |
ACPI_MODULE_NAME("psparse") |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ps_get_opcode_size |
* |
* PARAMETERS: opcode - An AML opcode |
* |
* RETURN: Size of the opcode, in bytes (1 or 2) |
* |
* DESCRIPTION: Get the size of the current opcode. |
* |
******************************************************************************/ |
u32 acpi_ps_get_opcode_size(u32 opcode) |
{ |
|
/* Extended (2-byte) opcode if > 255 */ |
|
if (opcode > 0x00FF) { |
return (2); |
} |
|
/* Otherwise, just a single byte opcode */ |
|
return (1); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ps_peek_opcode |
* |
* PARAMETERS: parser_state - A parser state object |
* |
* RETURN: Next AML opcode |
* |
* DESCRIPTION: Get next AML opcode (without incrementing AML pointer) |
* |
******************************************************************************/ |
|
u16 acpi_ps_peek_opcode(struct acpi_parse_state * parser_state) |
{ |
u8 *aml; |
u16 opcode; |
|
aml = parser_state->aml; |
opcode = (u16) ACPI_GET8(aml); |
|
if (opcode == AML_EXTENDED_OP_PREFIX) { |
|
/* Extended opcode, get the second opcode byte */ |
|
aml++; |
opcode = (u16) ((opcode << 8) | ACPI_GET8(aml)); |
} |
|
return (opcode); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ps_complete_this_op |
* |
* PARAMETERS: walk_state - Current State |
* op - Op to complete |
* |
* RETURN: Status |
* |
* DESCRIPTION: Perform any cleanup at the completion of an Op. |
* |
******************************************************************************/ |
|
acpi_status |
acpi_ps_complete_this_op(struct acpi_walk_state * walk_state, |
union acpi_parse_object * op) |
{ |
union acpi_parse_object *prev; |
union acpi_parse_object *next; |
const struct acpi_opcode_info *parent_info; |
union acpi_parse_object *replacement_op = NULL; |
acpi_status status = AE_OK; |
|
ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op); |
|
/* Check for null Op, can happen if AML code is corrupt */ |
|
if (!op) { |
return_ACPI_STATUS(AE_OK); /* OK for now */ |
} |
|
acpi_ex_stop_trace_opcode(op, walk_state); |
|
/* Delete this op and the subtree below it if asked to */ |
|
if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) != |
ACPI_PARSE_DELETE_TREE) |
|| (walk_state->op_info->class == AML_CLASS_ARGUMENT)) { |
return_ACPI_STATUS(AE_OK); |
} |
|
/* Make sure that we only delete this subtree */ |
|
if (op->common.parent) { |
prev = op->common.parent->common.value.arg; |
if (!prev) { |
|
/* Nothing more to do */ |
|
goto cleanup; |
} |
|
/* |
* Check if we need to replace the operator and its subtree |
* with a return value op (placeholder op) |
*/ |
parent_info = |
acpi_ps_get_opcode_info(op->common.parent->common. |
aml_opcode); |
|
switch (parent_info->class) { |
case AML_CLASS_CONTROL: |
|
break; |
|
case AML_CLASS_CREATE: |
/* |
* These opcodes contain term_arg operands. The current |
* op must be replaced by a placeholder return op |
*/ |
replacement_op = |
acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP, |
op->common.aml); |
if (!replacement_op) { |
status = AE_NO_MEMORY; |
} |
break; |
|
case AML_CLASS_NAMED_OBJECT: |
/* |
* These opcodes contain term_arg operands. The current |
* op must be replaced by a placeholder return op |
*/ |
if ((op->common.parent->common.aml_opcode == |
AML_REGION_OP) |
|| (op->common.parent->common.aml_opcode == |
AML_DATA_REGION_OP) |
|| (op->common.parent->common.aml_opcode == |
AML_BUFFER_OP) |
|| (op->common.parent->common.aml_opcode == |
AML_PACKAGE_OP) |
|| (op->common.parent->common.aml_opcode == |
AML_BANK_FIELD_OP) |
|| (op->common.parent->common.aml_opcode == |
AML_VAR_PACKAGE_OP)) { |
replacement_op = |
acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP, |
op->common.aml); |
if (!replacement_op) { |
status = AE_NO_MEMORY; |
} |
} else |
if ((op->common.parent->common.aml_opcode == |
AML_NAME_OP) |
&& (walk_state->pass_number <= |
ACPI_IMODE_LOAD_PASS2)) { |
if ((op->common.aml_opcode == AML_BUFFER_OP) |
|| (op->common.aml_opcode == AML_PACKAGE_OP) |
|| (op->common.aml_opcode == |
AML_VAR_PACKAGE_OP)) { |
replacement_op = |
acpi_ps_alloc_op(op->common. |
aml_opcode, |
op->common.aml); |
if (!replacement_op) { |
status = AE_NO_MEMORY; |
} else { |
replacement_op->named.data = |
op->named.data; |
replacement_op->named.length = |
op->named.length; |
} |
} |
} |
break; |
|
default: |
|
replacement_op = |
acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP, |
op->common.aml); |
if (!replacement_op) { |
status = AE_NO_MEMORY; |
} |
} |
|
/* We must unlink this op from the parent tree */ |
|
if (prev == op) { |
|
/* This op is the first in the list */ |
|
if (replacement_op) { |
replacement_op->common.parent = |
op->common.parent; |
replacement_op->common.value.arg = NULL; |
replacement_op->common.node = op->common.node; |
op->common.parent->common.value.arg = |
replacement_op; |
replacement_op->common.next = op->common.next; |
} else { |
op->common.parent->common.value.arg = |
op->common.next; |
} |
} |
|
/* Search the parent list */ |
|
else |
while (prev) { |
|
/* Traverse all siblings in the parent's argument list */ |
|
next = prev->common.next; |
if (next == op) { |
if (replacement_op) { |
replacement_op->common.parent = |
op->common.parent; |
replacement_op->common.value. |
arg = NULL; |
replacement_op->common.node = |
op->common.node; |
prev->common.next = |
replacement_op; |
replacement_op->common.next = |
op->common.next; |
next = NULL; |
} else { |
prev->common.next = |
op->common.next; |
next = NULL; |
} |
} |
prev = next; |
} |
} |
|
cleanup: |
|
/* Now we can actually delete the subtree rooted at Op */ |
|
acpi_ps_delete_parse_tree(op); |
return_ACPI_STATUS(status); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ps_next_parse_state |
* |
* PARAMETERS: walk_state - Current state |
* op - Current parse op |
* callback_status - Status from previous operation |
* |
* RETURN: Status |
* |
* DESCRIPTION: Update the parser state based upon the return exception from |
* the parser callback. |
* |
******************************************************************************/ |
|
acpi_status |
acpi_ps_next_parse_state(struct acpi_walk_state *walk_state, |
union acpi_parse_object *op, |
acpi_status callback_status) |
{ |
struct acpi_parse_state *parser_state = &walk_state->parser_state; |
acpi_status status = AE_CTRL_PENDING; |
|
ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op); |
|
switch (callback_status) { |
case AE_CTRL_TERMINATE: |
/* |
* A control method was terminated via a RETURN statement. |
* The walk of this method is complete. |
*/ |
parser_state->aml = parser_state->aml_end; |
status = AE_CTRL_TERMINATE; |
break; |
|
case AE_CTRL_BREAK: |
|
parser_state->aml = walk_state->aml_last_while; |
walk_state->control_state->common.value = FALSE; |
status = AE_CTRL_BREAK; |
break; |
|
case AE_CTRL_CONTINUE: |
|
parser_state->aml = walk_state->aml_last_while; |
status = AE_CTRL_CONTINUE; |
break; |
|
case AE_CTRL_PENDING: |
|
parser_state->aml = walk_state->aml_last_while; |
break; |
|
#if 0 |
case AE_CTRL_SKIP: |
|
parser_state->aml = parser_state->scope->parse_scope.pkg_end; |
status = AE_OK; |
break; |
#endif |
|
case AE_CTRL_TRUE: |
/* |
* Predicate of an IF was true, and we are at the matching ELSE. |
* Just close out this package |
*/ |
parser_state->aml = acpi_ps_get_next_package_end(parser_state); |
status = AE_CTRL_PENDING; |
break; |
|
case AE_CTRL_FALSE: |
/* |
* Either an IF/WHILE Predicate was false or we encountered a BREAK |
* opcode. In both cases, we do not execute the rest of the |
* package; We simply close out the parent (finishing the walk of |
* this branch of the tree) and continue execution at the parent |
* level. |
*/ |
parser_state->aml = parser_state->scope->parse_scope.pkg_end; |
|
/* In the case of a BREAK, just force a predicate (if any) to FALSE */ |
|
walk_state->control_state->common.value = FALSE; |
status = AE_CTRL_END; |
break; |
|
case AE_CTRL_TRANSFER: |
|
/* A method call (invocation) -- transfer control */ |
|
status = AE_CTRL_TRANSFER; |
walk_state->prev_op = op; |
walk_state->method_call_op = op; |
walk_state->method_call_node = |
(op->common.value.arg)->common.node; |
|
/* Will return value (if any) be used by the caller? */ |
|
walk_state->return_used = |
acpi_ds_is_result_used(op, walk_state); |
break; |
|
default: |
|
status = callback_status; |
if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) { |
status = AE_OK; |
} |
break; |
} |
|
return_ACPI_STATUS(status); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ps_parse_aml |
* |
* PARAMETERS: walk_state - Current state |
* |
* |
* RETURN: Status |
* |
* DESCRIPTION: Parse raw AML and return a tree of ops |
* |
******************************************************************************/ |
|
acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state) |
{ |
acpi_status status; |
struct acpi_thread_state *thread; |
struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list; |
struct acpi_walk_state *previous_walk_state; |
|
ACPI_FUNCTION_TRACE(ps_parse_aml); |
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
"Entered with WalkState=%p Aml=%p size=%X\n", |
walk_state, walk_state->parser_state.aml, |
walk_state->parser_state.aml_size)); |
|
if (!walk_state->parser_state.aml) { |
return_ACPI_STATUS(AE_NULL_OBJECT); |
} |
|
/* Create and initialize a new thread state */ |
|
thread = acpi_ut_create_thread_state(); |
if (!thread) { |
if (walk_state->method_desc) { |
|
/* Executing a control method - additional cleanup */ |
|
acpi_ds_terminate_control_method(walk_state-> |
method_desc, |
walk_state); |
} |
|
acpi_ds_delete_walk_state(walk_state); |
return_ACPI_STATUS(AE_NO_MEMORY); |
} |
|
walk_state->thread = thread; |
|
/* |
* If executing a method, the starting sync_level is this method's |
* sync_level |
*/ |
if (walk_state->method_desc) { |
walk_state->thread->current_sync_level = |
walk_state->method_desc->method.sync_level; |
} |
|
acpi_ds_push_walk_state(walk_state, thread); |
|
/* |
* This global allows the AML debugger to get a handle to the currently |
* executing control method. |
*/ |
acpi_gbl_current_walk_list = thread; |
|
/* |
* Execute the walk loop as long as there is a valid Walk State. This |
* handles nested control method invocations without recursion. |
*/ |
ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state)); |
|
status = AE_OK; |
while (walk_state) { |
if (ACPI_SUCCESS(status)) { |
/* |
* The parse_loop executes AML until the method terminates |
* or calls another method. |
*/ |
status = acpi_ps_parse_loop(walk_state); |
} |
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
"Completed one call to walk loop, %s State=%p\n", |
acpi_format_exception(status), walk_state)); |
|
if (status == AE_CTRL_TRANSFER) { |
/* |
* A method call was detected. |
* Transfer control to the called control method |
*/ |
status = |
acpi_ds_call_control_method(thread, walk_state, |
NULL); |
if (ACPI_FAILURE(status)) { |
status = |
acpi_ds_method_error(status, walk_state); |
} |
|
/* |
* If the transfer to the new method method call worked, a new walk |
* state was created -- get it |
*/ |
walk_state = acpi_ds_get_current_walk_state(thread); |
continue; |
} else if (status == AE_CTRL_TERMINATE) { |
status = AE_OK; |
} else if ((status != AE_OK) && (walk_state->method_desc)) { |
|
/* Either the method parse or actual execution failed */ |
|
ACPI_ERROR_METHOD("Method parse/execution failed", |
walk_state->method_node, NULL, |
status); |
|
/* Check for possible multi-thread reentrancy problem */ |
|
if ((status == AE_ALREADY_EXISTS) && |
(!(walk_state->method_desc->method. |
info_flags & ACPI_METHOD_SERIALIZED))) { |
/* |
* Method is not serialized and tried to create an object |
* twice. The probable cause is that the method cannot |
* handle reentrancy. Mark as "pending serialized" now, and |
* then mark "serialized" when the last thread exits. |
*/ |
walk_state->method_desc->method.info_flags |= |
ACPI_METHOD_SERIALIZED_PENDING; |
} |
} |
|
/* We are done with this walk, move on to the parent if any */ |
|
walk_state = acpi_ds_pop_walk_state(thread); |
|
/* Reset the current scope to the beginning of scope stack */ |
|
acpi_ds_scope_stack_clear(walk_state); |
|
/* |
* If we just returned from the execution of a control method or if we |
* encountered an error during the method parse phase, there's lots of |
* cleanup to do |
*/ |
if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == |
ACPI_PARSE_EXECUTE) || (ACPI_FAILURE(status))) { |
acpi_ds_terminate_control_method(walk_state-> |
method_desc, |
walk_state); |
} |
|
/* Delete this walk state and all linked control states */ |
|
acpi_ps_cleanup_scope(&walk_state->parser_state); |
previous_walk_state = walk_state; |
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
"ReturnValue=%p, ImplicitValue=%p State=%p\n", |
walk_state->return_desc, |
walk_state->implicit_return_obj, walk_state)); |
|
/* Check if we have restarted a preempted walk */ |
|
walk_state = acpi_ds_get_current_walk_state(thread); |
if (walk_state) { |
if (ACPI_SUCCESS(status)) { |
/* |
* There is another walk state, restart it. |
* If the method return value is not used by the parent, |
* The object is deleted |
*/ |
if (!previous_walk_state->return_desc) { |
/* |
* In slack mode execution, if there is no return value |
* we should implicitly return zero (0) as a default value. |
*/ |
if (acpi_gbl_enable_interpreter_slack && |
!previous_walk_state-> |
implicit_return_obj) { |
previous_walk_state-> |
implicit_return_obj = |
acpi_ut_create_integer_object |
((u64) 0); |
if (!previous_walk_state-> |
implicit_return_obj) { |
return_ACPI_STATUS |
(AE_NO_MEMORY); |
} |
} |
|
/* Restart the calling control method */ |
|
status = |
acpi_ds_restart_control_method |
(walk_state, |
previous_walk_state-> |
implicit_return_obj); |
} else { |
/* |
* We have a valid return value, delete any implicit |
* return value. |
*/ |
acpi_ds_clear_implicit_return |
(previous_walk_state); |
|
status = |
acpi_ds_restart_control_method |
(walk_state, |
previous_walk_state->return_desc); |
} |
if (ACPI_SUCCESS(status)) { |
walk_state->walk_type |= |
ACPI_WALK_METHOD_RESTART; |
} |
} else { |
/* On error, delete any return object or implicit return */ |
|
acpi_ut_remove_reference(previous_walk_state-> |
return_desc); |
acpi_ds_clear_implicit_return |
(previous_walk_state); |
} |
} |
|
/* |
* Just completed a 1st-level method, save the final internal return |
* value (if any) |
*/ |
else if (previous_walk_state->caller_return_desc) { |
if (previous_walk_state->implicit_return_obj) { |
*(previous_walk_state->caller_return_desc) = |
previous_walk_state->implicit_return_obj; |
} else { |
/* NULL if no return value */ |
|
*(previous_walk_state->caller_return_desc) = |
previous_walk_state->return_desc; |
} |
} else { |
if (previous_walk_state->return_desc) { |
|
/* Caller doesn't want it, must delete it */ |
|
acpi_ut_remove_reference(previous_walk_state-> |
return_desc); |
} |
if (previous_walk_state->implicit_return_obj) { |
|
/* Caller doesn't want it, must delete it */ |
|
acpi_ut_remove_reference(previous_walk_state-> |
implicit_return_obj); |
} |
} |
|
acpi_ds_delete_walk_state(previous_walk_state); |
} |
|
/* Normal exit */ |
|
acpi_ex_release_all_mutexes(thread); |
acpi_ut_delete_generic_state(ACPI_CAST_PTR |
(union acpi_generic_state, thread)); |
acpi_gbl_current_walk_list = prev_walk_list; |
return_ACPI_STATUS(status); |
} |