562 lines
14 KiB
C
562 lines
14 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: psloop - Main AML parse loop
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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*****************************************************************************/
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/*
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* Parse the AML and build an operation tree as most interpreters, (such as
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* Perl) do. Parsing is done by hand rather than with a YACC generated parser
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* to tightly constrain stack and dynamic memory usage. Parsing is kept
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* flexible and the code fairly compact by parsing based on a list of AML
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* opcode templates in aml_op_info[].
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acinterp.h"
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#include "acparser.h"
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#include "acdispat.h"
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#include "amlcode.h"
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#include "acconvert.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME("psloop")
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/* Local prototypes */
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static acpi_status
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acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
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u8 * aml_op_start, union acpi_parse_object *op);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_arguments
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*
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* PARAMETERS: walk_state - Current state
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* aml_op_start - Op start in AML
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* op - Current Op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Get arguments for passed Op.
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*
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******************************************************************************/
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static acpi_status
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acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
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u8 * aml_op_start, union acpi_parse_object *op)
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{
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acpi_status status = AE_OK;
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union acpi_parse_object *arg = NULL;
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ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
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"Get arguments for opcode [%s]\n",
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op->common.aml_op_name));
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switch (op->common.aml_opcode) {
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case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
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case AML_WORD_OP: /* AML_WORDDATA_ARG */
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case AML_DWORD_OP: /* AML_DWORDATA_ARG */
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case AML_QWORD_OP: /* AML_QWORDATA_ARG */
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case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
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/* Fill in constant or string argument directly */
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acpi_ps_get_next_simple_arg(&(walk_state->parser_state),
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GET_CURRENT_ARG_TYPE(walk_state->
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arg_types),
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op);
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break;
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case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
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status = acpi_ps_get_next_namepath(walk_state,
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&(walk_state->parser_state),
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op,
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ACPI_POSSIBLE_METHOD_CALL);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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walk_state->arg_types = 0;
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break;
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default:
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/*
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* Op is not a constant or string, append each argument to the Op
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*/
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while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
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!walk_state->arg_count) {
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walk_state->aml = walk_state->parser_state.aml;
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switch (op->common.aml_opcode) {
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case AML_METHOD_OP:
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case AML_BUFFER_OP:
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case AML_PACKAGE_OP:
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case AML_VARIABLE_PACKAGE_OP:
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case AML_WHILE_OP:
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break;
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default:
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ASL_CV_CAPTURE_COMMENTS(walk_state);
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break;
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}
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status =
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acpi_ps_get_next_arg(walk_state,
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&(walk_state->parser_state),
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GET_CURRENT_ARG_TYPE
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(walk_state->arg_types), &arg);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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if (arg) {
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acpi_ps_append_arg(op, arg);
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}
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INCREMENT_ARG_LIST(walk_state->arg_types);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
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"Final argument count: %8.8X pass %u\n",
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walk_state->arg_count,
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walk_state->pass_number));
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/* Special processing for certain opcodes */
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switch (op->common.aml_opcode) {
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case AML_METHOD_OP:
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/*
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* Skip parsing of control method because we don't have enough
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* info in the first pass to parse it correctly.
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*
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* Save the length and address of the body
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*/
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op->named.data = walk_state->parser_state.aml;
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op->named.length = (u32)
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(walk_state->parser_state.pkg_end -
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walk_state->parser_state.aml);
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/* Skip body of method */
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walk_state->parser_state.aml =
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walk_state->parser_state.pkg_end;
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walk_state->arg_count = 0;
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break;
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case AML_BUFFER_OP:
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case AML_PACKAGE_OP:
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case AML_VARIABLE_PACKAGE_OP:
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if ((op->common.parent) &&
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(op->common.parent->common.aml_opcode ==
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AML_NAME_OP)
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&& (walk_state->pass_number <=
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ACPI_IMODE_LOAD_PASS2)) {
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
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"Setup Package/Buffer: Pass %u, AML Ptr: %p\n",
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walk_state->pass_number,
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aml_op_start));
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/*
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* Skip parsing of Buffers and Packages because we don't have
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* enough info in the first pass to parse them correctly.
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*/
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op->named.data = aml_op_start;
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op->named.length = (u32)
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(walk_state->parser_state.pkg_end -
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aml_op_start);
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/* Skip body */
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walk_state->parser_state.aml =
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walk_state->parser_state.pkg_end;
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walk_state->arg_count = 0;
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}
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break;
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case AML_WHILE_OP:
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if (walk_state->control_state) {
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walk_state->control_state->control.package_end =
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walk_state->parser_state.pkg_end;
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}
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break;
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default:
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/* No action for all other opcodes */
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break;
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}
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break;
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_parse_loop
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*
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* PARAMETERS: walk_state - Current state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Parse AML (pointed to by the current parser state) and return
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* a tree of ops.
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*
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******************************************************************************/
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acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
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{
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acpi_status status = AE_OK;
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union acpi_parse_object *op = NULL; /* current op */
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struct acpi_parse_state *parser_state;
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u8 *aml_op_start = NULL;
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u8 opcode_length;
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ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
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if (walk_state->descending_callback == NULL) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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parser_state = &walk_state->parser_state;
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walk_state->arg_types = 0;
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#ifndef ACPI_CONSTANT_EVAL_ONLY
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if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
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/* We are restarting a preempted control method */
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if (acpi_ps_has_completed_scope(parser_state)) {
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/*
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* We must check if a predicate to an IF or WHILE statement
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* was just completed
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*/
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if ((parser_state->scope->parse_scope.op) &&
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((parser_state->scope->parse_scope.op->common.
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aml_opcode == AML_IF_OP)
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|| (parser_state->scope->parse_scope.op->common.
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aml_opcode == AML_WHILE_OP))
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&& (walk_state->control_state)
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&& (walk_state->control_state->common.state ==
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ACPI_CONTROL_PREDICATE_EXECUTING)) {
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/*
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* A predicate was just completed, get the value of the
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* predicate and branch based on that value
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*/
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walk_state->op = NULL;
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status =
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acpi_ds_get_predicate_value(walk_state,
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ACPI_TO_POINTER
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(TRUE));
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if (ACPI_FAILURE(status)
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&& !ACPI_CNTL_EXCEPTION(status)) {
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if (status == AE_AML_NO_RETURN_VALUE) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Invoked method did not return a value"));
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}
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ACPI_EXCEPTION((AE_INFO, status,
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"GetPredicate Failed"));
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return_ACPI_STATUS(status);
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}
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status =
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acpi_ps_next_parse_state(walk_state, op,
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status);
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}
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acpi_ps_pop_scope(parser_state, &op,
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&walk_state->arg_types,
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&walk_state->arg_count);
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
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"Popped scope, Op=%p\n", op));
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} else if (walk_state->prev_op) {
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/* We were in the middle of an op */
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op = walk_state->prev_op;
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walk_state->arg_types = walk_state->prev_arg_types;
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}
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}
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#endif
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/* Iterative parsing loop, while there is more AML to process: */
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while ((parser_state->aml < parser_state->aml_end) || (op)) {
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ASL_CV_CAPTURE_COMMENTS(walk_state);
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aml_op_start = parser_state->aml;
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if (!op) {
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status =
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acpi_ps_create_op(walk_state, aml_op_start, &op);
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if (ACPI_FAILURE(status)) {
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/*
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* ACPI_PARSE_MODULE_LEVEL means that we are loading a table by
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* executing it as a control method. However, if we encounter
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* an error while loading the table, we need to keep trying to
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* load the table rather than aborting the table load. Set the
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* status to AE_OK to proceed with the table load.
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*/
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if ((walk_state->
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parse_flags & ACPI_PARSE_MODULE_LEVEL)
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&& ((status == AE_ALREADY_EXISTS)
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|| (status == AE_NOT_FOUND))) {
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status = AE_OK;
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}
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if (status == AE_CTRL_PARSE_CONTINUE) {
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continue;
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}
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if (status == AE_CTRL_PARSE_PENDING) {
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status = AE_OK;
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}
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if (status == AE_CTRL_TERMINATE) {
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return_ACPI_STATUS(status);
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}
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status =
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acpi_ps_complete_op(walk_state, &op,
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status);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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if (acpi_ns_opens_scope
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(acpi_ps_get_opcode_info
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(walk_state->opcode)->object_type)) {
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/*
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* If the scope/device op fails to parse, skip the body of
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* the scope op because the parse failure indicates that
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* the device may not exist.
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*/
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ACPI_INFO(("Skipping parse of AML opcode: %s (0x%4.4X)", acpi_ps_get_opcode_name(walk_state->opcode), walk_state->opcode));
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/*
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* Determine the opcode length before skipping the opcode.
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* An opcode can be 1 byte or 2 bytes in length.
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*/
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opcode_length = 1;
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if ((walk_state->opcode & 0xFF00) ==
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AML_EXTENDED_OPCODE) {
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opcode_length = 2;
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}
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walk_state->parser_state.aml =
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walk_state->aml + opcode_length;
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walk_state->parser_state.aml =
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acpi_ps_get_next_package_end
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(&walk_state->parser_state);
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walk_state->aml =
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walk_state->parser_state.aml;
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}
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continue;
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}
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acpi_ex_start_trace_opcode(op, walk_state);
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}
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/*
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* Start arg_count at zero because we don't know if there are
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* any args yet
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*/
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walk_state->arg_count = 0;
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switch (op->common.aml_opcode) {
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case AML_BYTE_OP:
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case AML_WORD_OP:
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case AML_DWORD_OP:
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case AML_QWORD_OP:
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break;
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default:
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ASL_CV_CAPTURE_COMMENTS(walk_state);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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);
|
||
|
|
}
|
||
|
|
if ((walk_state->control_state) &&
|
||
|
|
((walk_state->control_state->control.
|
||
|
|
opcode == AML_IF_OP)
|
||
|
|
|| (walk_state->control_state->control.
|
||
|
|
opcode == AML_WHILE_OP))) {
|
||
|
|
/*
|
||
|
|
* If the if/while op fails to parse, we will skip parsing
|
||
|
|
* the body of the op.
|
||
|
|
*/
|
||
|
|
parser_state->aml =
|
||
|
|
walk_state->control_state->control.
|
||
|
|
aml_predicate_start + 1;
|
||
|
|
parser_state->aml =
|
||
|
|
acpi_ps_get_next_package_end
|
||
|
|
(parser_state);
|
||
|
|
walk_state->aml = parser_state->aml;
|
||
|
|
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Skipping While/If block"));
|
||
|
|
if (*walk_state->aml == AML_ELSE_OP) {
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Skipping Else block"));
|
||
|
|
walk_state->parser_state.aml =
|
||
|
|
walk_state->aml + 1;
|
||
|
|
walk_state->parser_state.aml =
|
||
|
|
acpi_ps_get_next_package_end
|
||
|
|
(parser_state);
|
||
|
|
walk_state->aml =
|
||
|
|
parser_state->aml;
|
||
|
|
}
|
||
|
|
ACPI_FREE(acpi_ut_pop_generic_state
|
||
|
|
(&walk_state->control_state));
|
||
|
|
}
|
||
|
|
op = NULL;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Check for arguments that need to be processed */
|
||
|
|
|
||
|
|
ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
|
||
|
|
"Parseloop: argument count: %8.8X\n",
|
||
|
|
walk_state->arg_count));
|
||
|
|
|
||
|
|
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;
|
||
|
|
} else
|
||
|
|
if ((walk_state->
|
||
|
|
parse_flags & ACPI_PARSE_MODULE_LEVEL)
|
||
|
|
&& (ACPI_AML_EXCEPTION(status)
|
||
|
|
|| status == AE_ALREADY_EXISTS
|
||
|
|
|| status == AE_NOT_FOUND)) {
|
||
|
|
/*
|
||
|
|
* ACPI_PARSE_MODULE_LEVEL flag means that we
|
||
|
|
* are currently loading a table by executing
|
||
|
|
* it as a control method. However, if we
|
||
|
|
* encounter an error while loading the table,
|
||
|
|
* we need to keep trying to load the table
|
||
|
|
* rather than aborting the table load (setting
|
||
|
|
* the status to AE_OK continues the table
|
||
|
|
* load). If we get a failure at this point, it
|
||
|
|
* means that the dispatcher got an error while
|
||
|
|
* trying to execute the Op.
|
||
|
|
*/
|
||
|
|
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);
|
||
|
|
}
|