0,0 → 1,626 |
/****************************************************************************** |
* |
* Module Name: psloop - Main AML parse loop |
* |
*****************************************************************************/ |
|
/* |
* 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, (such as |
* Perl) do. Parsing is done by hand rather than with a YACC generated parser |
* to tightly constrain stack and dynamic memory usage. 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 "acinterp.h" |
#include "acparser.h" |
#include "acdispat.h" |
#include "amlcode.h" |
|
#define _COMPONENT ACPI_PARSER |
ACPI_MODULE_NAME("psloop") |
|
/* Local prototypes */ |
static acpi_status |
acpi_ps_get_arguments(struct acpi_walk_state *walk_state, |
u8 * aml_op_start, union acpi_parse_object *op); |
|
static void |
acpi_ps_link_module_code(union acpi_parse_object *parent_op, |
u8 *aml_start, u32 aml_length, acpi_owner_id owner_id); |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ps_get_arguments |
* |
* PARAMETERS: walk_state - Current state |
* aml_op_start - Op start in AML |
* op - Current Op |
* |
* RETURN: Status |
* |
* DESCRIPTION: Get arguments for passed Op. |
* |
******************************************************************************/ |
|
static acpi_status |
acpi_ps_get_arguments(struct acpi_walk_state *walk_state, |
u8 * aml_op_start, union acpi_parse_object *op) |
{ |
acpi_status status = AE_OK; |
union acpi_parse_object *arg = NULL; |
const struct acpi_opcode_info *op_info; |
|
ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state); |
|
switch (op->common.aml_opcode) { |
case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ |
case AML_WORD_OP: /* AML_WORDDATA_ARG */ |
case AML_DWORD_OP: /* AML_DWORDATA_ARG */ |
case AML_QWORD_OP: /* AML_QWORDATA_ARG */ |
case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */ |
|
/* Fill in constant or string argument directly */ |
|
acpi_ps_get_next_simple_arg(&(walk_state->parser_state), |
GET_CURRENT_ARG_TYPE(walk_state-> |
arg_types), |
op); |
break; |
|
case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */ |
|
status = |
acpi_ps_get_next_namepath(walk_state, |
&(walk_state->parser_state), op, |
1); |
if (ACPI_FAILURE(status)) { |
return_ACPI_STATUS(status); |
} |
|
walk_state->arg_types = 0; |
break; |
|
default: |
/* |
* Op is not a constant or string, append each argument to the Op |
*/ |
while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) |
&& !walk_state->arg_count) { |
walk_state->aml = walk_state->parser_state.aml; |
|
status = |
acpi_ps_get_next_arg(walk_state, |
&(walk_state->parser_state), |
GET_CURRENT_ARG_TYPE |
(walk_state->arg_types), &arg); |
if (ACPI_FAILURE(status)) { |
return_ACPI_STATUS(status); |
} |
|
if (arg) { |
acpi_ps_append_arg(op, arg); |
} |
|
INCREMENT_ARG_LIST(walk_state->arg_types); |
} |
|
/* |
* Handle executable code at "module-level". This refers to |
* executable opcodes that appear outside of any control method. |
*/ |
if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) && |
((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) { |
/* |
* We want to skip If/Else/While constructs during Pass1 because we |
* want to actually conditionally execute the code during Pass2. |
* |
* Except for disassembly, where we always want to walk the |
* If/Else/While packages |
*/ |
switch (op->common.aml_opcode) { |
case AML_IF_OP: |
case AML_ELSE_OP: |
case AML_WHILE_OP: |
/* |
* Currently supported module-level opcodes are: |
* IF/ELSE/WHILE. These appear to be the most common, |
* and easiest to support since they open an AML |
* package. |
*/ |
if (walk_state->pass_number == |
ACPI_IMODE_LOAD_PASS1) { |
acpi_ps_link_module_code(op->common. |
parent, |
aml_op_start, |
(u32) |
(walk_state-> |
parser_state. |
pkg_end - |
aml_op_start), |
walk_state-> |
owner_id); |
} |
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
"Pass1: Skipping an If/Else/While body\n")); |
|
/* Skip body of if/else/while in pass 1 */ |
|
walk_state->parser_state.aml = |
walk_state->parser_state.pkg_end; |
walk_state->arg_count = 0; |
break; |
|
default: |
/* |
* Check for an unsupported executable opcode at module |
* level. We must be in PASS1, the parent must be a SCOPE, |
* The opcode class must be EXECUTE, and the opcode must |
* not be an argument to another opcode. |
*/ |
if ((walk_state->pass_number == |
ACPI_IMODE_LOAD_PASS1) |
&& (op->common.parent->common.aml_opcode == |
AML_SCOPE_OP)) { |
op_info = |
acpi_ps_get_opcode_info(op->common. |
aml_opcode); |
if ((op_info->class == |
AML_CLASS_EXECUTE) && (!arg)) { |
ACPI_WARNING((AE_INFO, |
"Unsupported module-level executable opcode " |
"0x%.2X at table offset 0x%.4X", |
op->common. |
aml_opcode, |
(u32) |
(ACPI_PTR_DIFF |
(aml_op_start, |
walk_state-> |
parser_state. |
aml_start) + |
sizeof(struct |
acpi_table_header)))); |
} |
} |
break; |
} |
} |
|
/* Special processing for certain opcodes */ |
|
switch (op->common.aml_opcode) { |
case AML_METHOD_OP: |
/* |
* Skip parsing of control method because we don't have enough |
* info in the first pass to parse it correctly. |
* |
* Save the length and address of the body |
*/ |
op->named.data = walk_state->parser_state.aml; |
op->named.length = (u32) |
(walk_state->parser_state.pkg_end - |
walk_state->parser_state.aml); |
|
/* Skip body of method */ |
|
walk_state->parser_state.aml = |
walk_state->parser_state.pkg_end; |
walk_state->arg_count = 0; |
break; |
|
case AML_BUFFER_OP: |
case AML_PACKAGE_OP: |
case AML_VAR_PACKAGE_OP: |
|
if ((op->common.parent) && |
(op->common.parent->common.aml_opcode == |
AML_NAME_OP) |
&& (walk_state->pass_number <= |
ACPI_IMODE_LOAD_PASS2)) { |
/* |
* Skip parsing of Buffers and Packages because we don't have |
* enough info in the first pass to parse them correctly. |
*/ |
op->named.data = aml_op_start; |
op->named.length = (u32) |
(walk_state->parser_state.pkg_end - |
aml_op_start); |
|
/* Skip body */ |
|
walk_state->parser_state.aml = |
walk_state->parser_state.pkg_end; |
walk_state->arg_count = 0; |
} |
break; |
|
case AML_WHILE_OP: |
|
if (walk_state->control_state) { |
walk_state->control_state->control.package_end = |
walk_state->parser_state.pkg_end; |
} |
break; |
|
default: |
|
/* No action for all other opcodes */ |
|
break; |
} |
|
break; |
} |
|
return_ACPI_STATUS(AE_OK); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ps_link_module_code |
* |
* PARAMETERS: parent_op - Parent parser op |
* aml_start - Pointer to the AML |
* aml_length - Length of executable AML |
* owner_id - owner_id of module level code |
* |
* RETURN: None. |
* |
* DESCRIPTION: Wrap the module-level code with a method object and link the |
* object to the global list. Note, the mutex field of the method |
* object is used to link multiple module-level code objects. |
* |
******************************************************************************/ |
|
static void |
acpi_ps_link_module_code(union acpi_parse_object *parent_op, |
u8 *aml_start, u32 aml_length, acpi_owner_id owner_id) |
{ |
union acpi_operand_object *prev; |
union acpi_operand_object *next; |
union acpi_operand_object *method_obj; |
struct acpi_namespace_node *parent_node; |
|
ACPI_FUNCTION_TRACE(ps_link_module_code); |
|
/* Get the tail of the list */ |
|
prev = next = acpi_gbl_module_code_list; |
while (next) { |
prev = next; |
next = next->method.mutex; |
} |
|
/* |
* Insert the module level code into the list. Merge it if it is |
* adjacent to the previous element. |
*/ |
if (!prev || |
((prev->method.aml_start + prev->method.aml_length) != aml_start)) { |
|
/* Create, initialize, and link a new temporary method object */ |
|
method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD); |
if (!method_obj) { |
return_VOID; |
} |
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
"Create/Link new code block: %p\n", |
method_obj)); |
|
if (parent_op->common.node) { |
parent_node = parent_op->common.node; |
} else { |
parent_node = acpi_gbl_root_node; |
} |
|
method_obj->method.aml_start = aml_start; |
method_obj->method.aml_length = aml_length; |
method_obj->method.owner_id = owner_id; |
method_obj->method.info_flags |= ACPI_METHOD_MODULE_LEVEL; |
|
/* |
* Save the parent node in next_object. This is cheating, but we |
* don't want to expand the method object. |
*/ |
method_obj->method.next_object = |
ACPI_CAST_PTR(union acpi_operand_object, parent_node); |
|
if (!prev) { |
acpi_gbl_module_code_list = method_obj; |
} else { |
prev->method.mutex = method_obj; |
} |
} else { |
ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
"Appending to existing code block: %p\n", |
prev)); |
|
prev->method.aml_length += aml_length; |
} |
|
return_VOID; |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ps_parse_loop |
* |
* PARAMETERS: walk_state - Current state |
* |
* RETURN: Status |
* |
* DESCRIPTION: Parse AML (pointed to by the current parser state) and return |
* a tree of ops. |
* |
******************************************************************************/ |
|
acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state) |
{ |
acpi_status status = AE_OK; |
union acpi_parse_object *op = NULL; /* current op */ |
struct acpi_parse_state *parser_state; |
u8 *aml_op_start = NULL; |
|
ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state); |
|
if (walk_state->descending_callback == NULL) { |
return_ACPI_STATUS(AE_BAD_PARAMETER); |
} |
|
parser_state = &walk_state->parser_state; |
walk_state->arg_types = 0; |
|
#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) |
|
if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) { |
|
/* We are restarting a preempted control method */ |
|
if (acpi_ps_has_completed_scope(parser_state)) { |
/* |
* We must check if a predicate to an IF or WHILE statement |
* was just completed |
*/ |
if ((parser_state->scope->parse_scope.op) && |
((parser_state->scope->parse_scope.op->common. |
aml_opcode == AML_IF_OP) |
|| (parser_state->scope->parse_scope.op->common. |
aml_opcode == AML_WHILE_OP)) |
&& (walk_state->control_state) |
&& (walk_state->control_state->common.state == |
ACPI_CONTROL_PREDICATE_EXECUTING)) { |
/* |
* A predicate was just completed, get the value of the |
* predicate and branch based on that value |
*/ |
walk_state->op = NULL; |
status = |
acpi_ds_get_predicate_value(walk_state, |
ACPI_TO_POINTER |
(TRUE)); |
if (ACPI_FAILURE(status) |
&& ((status & AE_CODE_MASK) != |
AE_CODE_CONTROL)) { |
if (status == AE_AML_NO_RETURN_VALUE) { |
ACPI_EXCEPTION((AE_INFO, status, |
"Invoked method did not return a value")); |
} |
|
ACPI_EXCEPTION((AE_INFO, status, |
"GetPredicate Failed")); |
return_ACPI_STATUS(status); |
} |
|
status = |
acpi_ps_next_parse_state(walk_state, op, |
status); |
} |
|
acpi_ps_pop_scope(parser_state, &op, |
&walk_state->arg_types, |
&walk_state->arg_count); |
ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
"Popped scope, Op=%p\n", op)); |
} else if (walk_state->prev_op) { |
|
/* We were in the middle of an op */ |
|
op = walk_state->prev_op; |
walk_state->arg_types = walk_state->prev_arg_types; |
} |
} |
#endif |
|
/* Iterative parsing loop, while there is more AML to process: */ |
|
while ((parser_state->aml < parser_state->aml_end) || (op)) { |
aml_op_start = parser_state->aml; |
if (!op) { |
status = |
acpi_ps_create_op(walk_state, aml_op_start, &op); |
if (ACPI_FAILURE(status)) { |
if (status == AE_CTRL_PARSE_CONTINUE) { |
continue; |
} |
|
if (status == AE_CTRL_PARSE_PENDING) { |
status = AE_OK; |
} |
|
if (status == AE_CTRL_TERMINATE) { |
return_ACPI_STATUS(status); |
} |
|
status = |
acpi_ps_complete_op(walk_state, &op, |
status); |
if (ACPI_FAILURE(status)) { |
return_ACPI_STATUS(status); |
} |
|
continue; |
} |
|
acpi_ex_start_trace_opcode(op, walk_state); |
} |
|
/* |
* Start arg_count at zero because we don't know if there are |
* any args yet |
*/ |
walk_state->arg_count = 0; |
|
/* Are there any arguments that must be processed? */ |
|
if (walk_state->arg_types) { |
|
/* Get arguments */ |
|
status = |
acpi_ps_get_arguments(walk_state, aml_op_start, op); |
if (ACPI_FAILURE(status)) { |
status = |
acpi_ps_complete_op(walk_state, &op, |
status); |
if (ACPI_FAILURE(status)) { |
return_ACPI_STATUS(status); |
} |
|
continue; |
} |
} |
|
/* Check for arguments that need to be processed */ |
|
if (walk_state->arg_count) { |
/* |
* There are arguments (complex ones), push Op and |
* prepare for argument |
*/ |
status = acpi_ps_push_scope(parser_state, op, |
walk_state->arg_types, |
walk_state->arg_count); |
if (ACPI_FAILURE(status)) { |
status = |
acpi_ps_complete_op(walk_state, &op, |
status); |
if (ACPI_FAILURE(status)) { |
return_ACPI_STATUS(status); |
} |
|
continue; |
} |
|
op = NULL; |
continue; |
} |
|
/* |
* All arguments have been processed -- Op is complete, |
* prepare for next |
*/ |
walk_state->op_info = |
acpi_ps_get_opcode_info(op->common.aml_opcode); |
if (walk_state->op_info->flags & AML_NAMED) { |
if (op->common.aml_opcode == AML_REGION_OP || |
op->common.aml_opcode == AML_DATA_REGION_OP) { |
/* |
* Skip parsing of control method or opregion body, |
* because we don't have enough info in the first pass |
* to parse them correctly. |
* |
* Completed parsing an op_region declaration, we now |
* know the length. |
*/ |
op->named.length = |
(u32) (parser_state->aml - op->named.data); |
} |
} |
|
if (walk_state->op_info->flags & AML_CREATE) { |
/* |
* Backup to beginning of create_XXXfield declaration (1 for |
* Opcode) |
* |
* body_length is unknown until we parse the body |
*/ |
op->named.length = |
(u32) (parser_state->aml - op->named.data); |
} |
|
if (op->common.aml_opcode == AML_BANK_FIELD_OP) { |
/* |
* Backup to beginning of bank_field declaration |
* |
* body_length is unknown until we parse the body |
*/ |
op->named.length = |
(u32) (parser_state->aml - op->named.data); |
} |
|
/* This op complete, notify the dispatcher */ |
|
if (walk_state->ascending_callback != NULL) { |
walk_state->op = op; |
walk_state->opcode = op->common.aml_opcode; |
|
status = walk_state->ascending_callback(walk_state); |
status = |
acpi_ps_next_parse_state(walk_state, op, status); |
if (status == AE_CTRL_PENDING) { |
status = AE_OK; |
} |
} |
|
status = acpi_ps_complete_op(walk_state, &op, status); |
if (ACPI_FAILURE(status)) { |
return_ACPI_STATUS(status); |
} |
|
} /* while parser_state->Aml */ |
|
status = acpi_ps_complete_final_op(walk_state, op, status); |
return_ACPI_STATUS(status); |
} |