diff options
Diffstat (limited to 'drivers/acpi/acpica/psparse.c')
| -rw-r--r-- | drivers/acpi/acpica/psparse.c | 687 |
1 files changed, 687 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/psparse.c b/drivers/acpi/acpica/psparse.c new file mode 100644 index 000000000..bd3caf735 --- /dev/null +++ b/drivers/acpi/acpica/psparse.c @@ -0,0 +1,687 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: psparse - Parser top level AML parse routines + * + * Copyright (C) 2000 - 2020, Intel Corp. + * + *****************************************************************************/ + +/* + * 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" +#include "acnamesp.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_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_VARIABLE_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_VARIABLE_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_BAD_ADDRESS); + } + + /* 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 (walk_state->method_pathname && walk_state->method_is_nested) { + + /* Optional object evaluation log */ + + ACPI_DEBUG_PRINT_RAW((ACPI_DB_EVALUATION, + "%-26s: %*s%s\n", + " Exit nested method", + (walk_state-> + method_nesting_depth + 1) * 3, + " ", + &walk_state->method_pathname[1])); + + ACPI_FREE(walk_state->method_pathname); + walk_state->method_is_nested = FALSE; + } + 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_ex_exit_interpreter(); + if (status == AE_ABORT_METHOD) { + acpi_ns_print_node_pathname(walk_state-> + method_node, + "Aborting method"); + acpi_os_printf("\n"); + } else { + ACPI_ERROR_METHOD("Aborting method", + walk_state->method_node, NULL, + status); + } + acpi_ex_enter_interpreter(); + + /* 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 && + !(walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL)) || + (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); +} |