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linux/drivers/acpi/parser/psloop.c

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/******************************************************************************
*
* Module Name: psloop - Main AML parse loop
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* 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 <acpi/acparser.h>
#include <acpi/acdispat.h>
#include <acpi/amlcode.h>
#define _COMPONENT ACPI_PARSER
ACPI_MODULE_NAME("psloop")
static u32 acpi_gbl_depth = 0;
/*******************************************************************************
*
* 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;
acpi_status status2;
union acpi_parse_object *op = NULL; /* current op */
union acpi_parse_object *arg = NULL;
union acpi_parse_object *pre_op = NULL;
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_DEBUG_PRINT((ACPI_DB_ERROR,
"Invoked method did not return a value, %s\n",
acpi_format_exception
(status)));
}
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"get_predicate Failed, %s\n",
acpi_format_exception
(status)));
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) {
/* Get the next opcode from the AML stream */
walk_state->aml_offset =
(u32) ACPI_PTR_DIFF(parser_state->aml,
parser_state->aml_start);
walk_state->opcode = acpi_ps_peek_opcode(parser_state);
/*
* First cut to determine what we have found:
* 1) A valid AML opcode
* 2) A name string
* 3) An unknown/invalid opcode
*/
walk_state->op_info =
acpi_ps_get_opcode_info(walk_state->opcode);
switch (walk_state->op_info->class) {
case AML_CLASS_ASCII:
case AML_CLASS_PREFIX:
/*
* Starts with a valid prefix or ASCII char, this is a name
* string. Convert the bare name string to a namepath.
*/
walk_state->opcode = AML_INT_NAMEPATH_OP;
walk_state->arg_types = ARGP_NAMESTRING;
break;
case AML_CLASS_UNKNOWN:
/* The opcode is unrecognized. Just skip unknown opcodes */
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Found unknown opcode %X at AML address %p offset %X, ignoring\n",
walk_state->opcode,
parser_state->aml,
walk_state->aml_offset));
ACPI_DUMP_BUFFER(parser_state->aml, 128);
/* Assume one-byte bad opcode */
parser_state->aml++;
continue;
default:
/* Found opcode info, this is a normal opcode */
parser_state->aml +=
acpi_ps_get_opcode_size(walk_state->opcode);
walk_state->arg_types =
walk_state->op_info->parse_args;
break;
}
/* Create Op structure and append to parent's argument list */
if (walk_state->op_info->flags & AML_NAMED) {
/* Allocate a new pre_op if necessary */
if (!pre_op) {
pre_op =
acpi_ps_alloc_op(walk_state->
opcode);
if (!pre_op) {
status = AE_NO_MEMORY;
goto close_this_op;
}
}
pre_op->common.value.arg = NULL;
pre_op->common.aml_opcode = walk_state->opcode;
/*
* Get and append arguments until we find the node that contains
* the name (the type ARGP_NAME).
*/
while (GET_CURRENT_ARG_TYPE
(walk_state->arg_types)
&&
(GET_CURRENT_ARG_TYPE
(walk_state->arg_types) != ARGP_NAME)) {
status =
acpi_ps_get_next_arg(walk_state,
parser_state,
GET_CURRENT_ARG_TYPE
(walk_state->
arg_types),
&arg);
if (ACPI_FAILURE(status)) {
goto close_this_op;
}
acpi_ps_append_arg(pre_op, arg);
INCREMENT_ARG_LIST(walk_state->
arg_types);
}
/*
* Make sure that we found a NAME and didn't run out of
* arguments
*/
if (!GET_CURRENT_ARG_TYPE
(walk_state->arg_types)) {
status = AE_AML_NO_OPERAND;
goto close_this_op;
}
/* We know that this arg is a name, move to next arg */
INCREMENT_ARG_LIST(walk_state->arg_types);
/*
* Find the object. This will either insert the object into
* the namespace or simply look it up
*/
walk_state->op = NULL;
status =
walk_state->descending_callback(walk_state,
&op);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"During name lookup/catalog, %s\n",
acpi_format_exception
(status)));
goto close_this_op;
}
if (!op) {
continue;
}
status =
acpi_ps_next_parse_state(walk_state, op,
status);
if (status == AE_CTRL_PENDING) {
status = AE_OK;
goto close_this_op;
}
if (ACPI_FAILURE(status)) {
goto close_this_op;
}
acpi_ps_append_arg(op,
pre_op->common.value.arg);
acpi_gbl_depth++;
if (op->common.aml_opcode == AML_REGION_OP) {
/*
* Defer final parsing of an operation_region body,
* because we don't have enough info in the first pass
* to parse it correctly (i.e., there may be method
* calls within the term_arg elements of the body.)
*
* However, we must continue parsing because
* the opregion is not a standalone package --
* we don't know where the end is at this point.
*
* (Length is unknown until parse of the body complete)
*/
op->named.data = aml_op_start;
op->named.length = 0;
}
} else {
/* Not a named opcode, just allocate Op and append to parent */
walk_state->op_info =
acpi_ps_get_opcode_info(walk_state->opcode);
op = acpi_ps_alloc_op(walk_state->opcode);
if (!op) {
status = AE_NO_MEMORY;
goto close_this_op;
}
if (walk_state->op_info->flags & AML_CREATE) {
/*
* Backup to beginning of create_xXXfield declaration
* body_length is unknown until we parse the body
*/
op->named.data = aml_op_start;
op->named.length = 0;
}
acpi_ps_append_arg(acpi_ps_get_parent_scope
(parser_state), op);
if ((walk_state->descending_callback != NULL)) {
/*
* Find the object. This will either insert the object into
* the namespace or simply look it up
*/
walk_state->op = op;
status =
walk_state->
descending_callback(walk_state,
&op);
status =
acpi_ps_next_parse_state(walk_state,
op,
status);
if (status == AE_CTRL_PENDING) {
status = AE_OK;
goto close_this_op;
}
if (ACPI_FAILURE(status)) {
goto close_this_op;
}
}
}
op->common.aml_offset = walk_state->aml_offset;
if (walk_state->op_info) {
ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
"Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n",
(u32) op->common.aml_opcode,
walk_state->op_info->name, op,
parser_state->aml,
op->common.aml_offset));
}
}
/*
* 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 */
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(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,
parser_state, op,
1);
if (ACPI_FAILURE(status)) {
goto close_this_op;
}
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_offset = (u32)
ACPI_PTR_DIFF(parser_state->aml,
parser_state->
aml_start);
status =
acpi_ps_get_next_arg(walk_state,
parser_state,
GET_CURRENT_ARG_TYPE
(walk_state->
arg_types),
&arg);
if (ACPI_FAILURE(status)) {
goto close_this_op;
}
if (arg) {
arg->common.aml_offset =
walk_state->aml_offset;
acpi_ps_append_arg(op, arg);
}
INCREMENT_ARG_LIST(walk_state->
arg_types);
}
/* Special processing for certain opcodes */
/* TBD (remove): Temporary mechanism to disable this code if needed */
#ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
if ((walk_state->pass_number <=
ACPI_IMODE_LOAD_PASS1)
&&
((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:
ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
"Pass1: Skipping an If/Else/While body\n"));
/* Skip body of if/else/while in pass 1 */
parser_state->aml =
parser_state->pkg_end;
walk_state->arg_count = 0;
break;
default:
break;
}
}
#endif
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 = parser_state->aml;
op->named.length =
(u32) (parser_state->pkg_end -
parser_state->aml);
/* Skip body of method */
parser_state->aml =
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) (parser_state->
pkg_end -
aml_op_start);
/* Skip body */
parser_state->aml =
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 =
parser_state->pkg_end;
}
break;
default:
/* No action for all other opcodes */
break;
}
break;
}
}
/* 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)) {
goto close_this_op;
}
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 (acpi_gbl_depth) {
acpi_gbl_depth--;
}
if (op->common.aml_opcode == AML_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);
}
/* 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;
goto close_this_op;
}
}
close_this_op:
/*
* Finished one argument of the containing scope
*/
parser_state->scope->parse_scope.arg_count--;
/* Finished with pre_op */
if (pre_op) {
acpi_ps_free_op(pre_op);
pre_op = NULL;
}
/* Close this Op (will result in parse subtree deletion) */
status2 = acpi_ps_complete_this_op(walk_state, op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
op = NULL;
switch (status) {
case AE_OK:
break;
case AE_CTRL_TRANSFER:
/* We are about to transfer to a called method. */
walk_state->prev_op = op;
walk_state->prev_arg_types = walk_state->arg_types;
return_ACPI_STATUS(status);
case AE_CTRL_END:
acpi_ps_pop_scope(parser_state, &op,
&walk_state->arg_types,
&walk_state->arg_count);
if (op) {
walk_state->op = op;
walk_state->op_info =
acpi_ps_get_opcode_info(op->common.
aml_opcode);
walk_state->opcode = op->common.aml_opcode;
status =
walk_state->ascending_callback(walk_state);
status =
acpi_ps_next_parse_state(walk_state, op,
status);
status2 =
acpi_ps_complete_this_op(walk_state, op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
op = NULL;
}
status = AE_OK;
break;
case AE_CTRL_BREAK:
case AE_CTRL_CONTINUE:
/* Pop off scopes until we find the While */
while (!op || (op->common.aml_opcode != AML_WHILE_OP)) {
acpi_ps_pop_scope(parser_state, &op,
&walk_state->arg_types,
&walk_state->arg_count);
}
/* Close this iteration of the While loop */
walk_state->op = op;
walk_state->op_info =
acpi_ps_get_opcode_info(op->common.aml_opcode);
walk_state->opcode = op->common.aml_opcode;
status = walk_state->ascending_callback(walk_state);
status =
acpi_ps_next_parse_state(walk_state, op, status);
status2 = acpi_ps_complete_this_op(walk_state, op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
op = NULL;
status = AE_OK;
break;
case AE_CTRL_TERMINATE:
status = AE_OK;
/* Clean up */
do {
if (op) {
status2 =
acpi_ps_complete_this_op(walk_state,
op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
}
acpi_ps_pop_scope(parser_state, &op,
&walk_state->arg_types,
&walk_state->arg_count);
} while (op);
return_ACPI_STATUS(status);
default: /* All other non-AE_OK status */
do {
if (op) {
status2 =
acpi_ps_complete_this_op(walk_state,
op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
}
acpi_ps_pop_scope(parser_state, &op,
&walk_state->arg_types,
&walk_state->arg_count);
} while (op);
/*
* TBD: Cleanup parse ops on error
*/
#if 0
if (op == NULL) {
acpi_ps_pop_scope(parser_state, &op,
&walk_state->arg_types,
&walk_state->arg_count);
}
#endif
walk_state->prev_op = op;
walk_state->prev_arg_types = walk_state->arg_types;
return_ACPI_STATUS(status);
}
/* This scope complete? */
if (acpi_ps_has_completed_scope(parser_state)) {
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 {
op = NULL;
}
} /* while parser_state->Aml */
/*
* Complete the last Op (if not completed), and clear the scope stack.
* It is easily possible to end an AML "package" with an unbounded number
* of open scopes (such as when several ASL blocks are closed with
* sequential closing braces). We want to terminate each one cleanly.
*/
ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
op));
do {
if (op) {
if (walk_state->ascending_callback != NULL) {
walk_state->op = op;
walk_state->op_info =
acpi_ps_get_opcode_info(op->common.
aml_opcode);
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;
goto close_this_op;
}
if (status == AE_CTRL_TERMINATE) {
status = AE_OK;
/* Clean up */
do {
if (op) {
status2 =
acpi_ps_complete_this_op
(walk_state, op);
if (ACPI_FAILURE
(status2)) {
return_ACPI_STATUS
(status2);
}
}
acpi_ps_pop_scope(parser_state,
&op,
&walk_state->
arg_types,
&walk_state->
arg_count);
} while (op);
return_ACPI_STATUS(status);
}
else if (ACPI_FAILURE(status)) {
/* First error is most important */
(void)
acpi_ps_complete_this_op(walk_state,
op);
return_ACPI_STATUS(status);
}
}
status2 = acpi_ps_complete_this_op(walk_state, op);
if (ACPI_FAILURE(status2)) {
return_ACPI_STATUS(status2);
}
}
acpi_ps_pop_scope(parser_state, &op, &walk_state->arg_types,
&walk_state->arg_count);
} while (op);
return_ACPI_STATUS(status);
}
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