/****************************************************************************** * * Module Name: psparse - Parser top level AML parse routines * *****************************************************************************/ /* * Copyright (C) 2000 - 2007, 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 #include #include #include #include #include #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_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 */ } /* 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); if (!replacement_op) { goto allocate_error; } 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_VAR_PACKAGE_OP)) { replacement_op = acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); if (!replacement_op) { goto allocate_error; } } 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); if (!replacement_op) { goto allocate_error; } 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); if (!replacement_op) { goto allocate_error; } } /* 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(AE_OK); allocate_error: /* Always delete the subtree, even on error */ acpi_ps_delete_parse_tree(op); return_ACPI_STATUS(AE_NO_MEMORY); } /******************************************************************************* * * 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)); /* Create and initialize a new thread state */ thread = acpi_ut_create_thread_state(); if (!thread) { 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.mutex)) { ACPI_INFO((AE_INFO, "Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error", walk_state->method_node->name. ascii)); /* * Method tried to create an object twice. The probable cause is * that the method cannot handle reentrancy. * * The method is marked not_serialized, but it tried to create * a named object, causing the second thread entrance to fail. * Workaround this problem by marking the method permanently * as Serialized. */ walk_state->method_desc->method.method_flags |= AML_METHOD_SERIALIZED; walk_state->method_desc->method.sync_level = 0; } } /* 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) { 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 */ acpi_ut_remove_reference(previous_walk_state-> return_desc); } } /* * 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); }