| // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
| /****************************************************************************** |
| * |
| * Module Name: exoparg3 - AML execution - opcodes with 3 arguments |
| * |
| * Copyright (C) 2000 - 2022, Intel Corp. |
| * |
| *****************************************************************************/ |
| |
| #include <acpi/acpi.h> |
| #include "accommon.h" |
| #include "acinterp.h" |
| #include "acparser.h" |
| #include "amlcode.h" |
| |
| #define _COMPONENT ACPI_EXECUTER |
| ACPI_MODULE_NAME("exoparg3") |
| |
| /*! |
| * Naming convention for AML interpreter execution routines. |
| * |
| * The routines that begin execution of AML opcodes are named with a common |
| * convention based upon the number of arguments, the number of target operands, |
| * and whether or not a value is returned: |
| * |
| * AcpiExOpcode_xA_yT_zR |
| * |
| * Where: |
| * |
| * xA - ARGUMENTS: The number of arguments (input operands) that are |
| * required for this opcode type (1 through 6 args). |
| * yT - TARGETS: The number of targets (output operands) that are required |
| * for this opcode type (0, 1, or 2 targets). |
| * zR - RETURN VALUE: Indicates whether this opcode type returns a value |
| * as the function return (0 or 1). |
| * |
| * The AcpiExOpcode* functions are called via the Dispatcher component with |
| * fully resolved operands. |
| !*/ |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ex_opcode_3A_0T_0R |
| * |
| * PARAMETERS: walk_state - Current walk state |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Execute Triadic operator (3 operands) |
| * |
| ******************************************************************************/ |
| acpi_status acpi_ex_opcode_3A_0T_0R(struct acpi_walk_state *walk_state) |
| { |
| union acpi_operand_object **operand = &walk_state->operands[0]; |
| struct acpi_signal_fatal_info *fatal; |
| acpi_status status = AE_OK; |
| |
| ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_0T_0R, |
| acpi_ps_get_opcode_name(walk_state->opcode)); |
| |
| switch (walk_state->opcode) { |
| case AML_FATAL_OP: /* Fatal (fatal_type fatal_code fatal_arg) */ |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| "FatalOp: Type %X Code %X Arg %X " |
| "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n", |
| (u32)operand[0]->integer.value, |
| (u32)operand[1]->integer.value, |
| (u32)operand[2]->integer.value)); |
| |
| fatal = ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info)); |
| if (fatal) { |
| fatal->type = (u32) operand[0]->integer.value; |
| fatal->code = (u32) operand[1]->integer.value; |
| fatal->argument = (u32) operand[2]->integer.value; |
| } |
| |
| /* Always signal the OS! */ |
| |
| status = acpi_os_signal(ACPI_SIGNAL_FATAL, fatal); |
| |
| /* Might return while OS is shutting down, just continue */ |
| |
| ACPI_FREE(fatal); |
| goto cleanup; |
| |
| case AML_EXTERNAL_OP: |
| /* |
| * If the interpreter sees this opcode, just ignore it. The External |
| * op is intended for use by disassemblers in order to properly |
| * disassemble control method invocations. The opcode or group of |
| * opcodes should be surrounded by an "if (0)" clause to ensure that |
| * AML interpreters never see the opcode. Thus, something is |
| * wrong if an external opcode ever gets here. |
| */ |
| ACPI_ERROR((AE_INFO, "Executed External Op")); |
| status = AE_OK; |
| goto cleanup; |
| |
| default: |
| |
| ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", |
| walk_state->opcode)); |
| |
| status = AE_AML_BAD_OPCODE; |
| goto cleanup; |
| } |
| |
| cleanup: |
| |
| return_ACPI_STATUS(status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ex_opcode_3A_1T_1R |
| * |
| * PARAMETERS: walk_state - Current walk state |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Execute Triadic operator (3 operands) |
| * |
| ******************************************************************************/ |
| |
| acpi_status acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state *walk_state) |
| { |
| union acpi_operand_object **operand = &walk_state->operands[0]; |
| union acpi_operand_object *return_desc = NULL; |
| char *buffer = NULL; |
| acpi_status status = AE_OK; |
| u64 index; |
| acpi_size length; |
| |
| ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R, |
| acpi_ps_get_opcode_name(walk_state->opcode)); |
| |
| switch (walk_state->opcode) { |
| case AML_MID_OP: /* Mid (Source[0], Index[1], Length[2], Result[3]) */ |
| /* |
| * Create the return object. The Source operand is guaranteed to be |
| * either a String or a Buffer, so just use its type. |
| */ |
| return_desc = acpi_ut_create_internal_object((operand[0])-> |
| common.type); |
| if (!return_desc) { |
| status = AE_NO_MEMORY; |
| goto cleanup; |
| } |
| |
| /* Get the Integer values from the objects */ |
| |
| index = operand[1]->integer.value; |
| length = (acpi_size)operand[2]->integer.value; |
| |
| /* |
| * If the index is beyond the length of the String/Buffer, or if the |
| * requested length is zero, return a zero-length String/Buffer |
| */ |
| if (index >= operand[0]->string.length) { |
| length = 0; |
| } |
| |
| /* Truncate request if larger than the actual String/Buffer */ |
| |
| else if ((index + length) > operand[0]->string.length) { |
| length = |
| (acpi_size)operand[0]->string.length - |
| (acpi_size)index; |
| } |
| |
| /* Strings always have a sub-pointer, not so for buffers */ |
| |
| switch ((operand[0])->common.type) { |
| case ACPI_TYPE_STRING: |
| |
| /* Always allocate a new buffer for the String */ |
| |
| buffer = ACPI_ALLOCATE_ZEROED((acpi_size)length + 1); |
| if (!buffer) { |
| status = AE_NO_MEMORY; |
| goto cleanup; |
| } |
| break; |
| |
| case ACPI_TYPE_BUFFER: |
| |
| /* If the requested length is zero, don't allocate a buffer */ |
| |
| if (length > 0) { |
| |
| /* Allocate a new buffer for the Buffer */ |
| |
| buffer = ACPI_ALLOCATE_ZEROED(length); |
| if (!buffer) { |
| status = AE_NO_MEMORY; |
| goto cleanup; |
| } |
| } |
| break; |
| |
| default: /* Should not happen */ |
| |
| status = AE_AML_OPERAND_TYPE; |
| goto cleanup; |
| } |
| |
| if (buffer) { |
| |
| /* We have a buffer, copy the portion requested */ |
| |
| memcpy(buffer, |
| operand[0]->string.pointer + index, length); |
| } |
| |
| /* Set the length of the new String/Buffer */ |
| |
| return_desc->string.pointer = buffer; |
| return_desc->string.length = (u32) length; |
| |
| /* Mark buffer initialized */ |
| |
| return_desc->buffer.flags |= AOPOBJ_DATA_VALID; |
| break; |
| |
| default: |
| |
| ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", |
| walk_state->opcode)); |
| |
| status = AE_AML_BAD_OPCODE; |
| goto cleanup; |
| } |
| |
| /* Store the result in the target */ |
| |
| status = acpi_ex_store(return_desc, operand[3], walk_state); |
| |
| cleanup: |
| |
| /* Delete return object on error */ |
| |
| if (ACPI_FAILURE(status) || walk_state->result_obj) { |
| acpi_ut_remove_reference(return_desc); |
| walk_state->result_obj = NULL; |
| } else { |
| /* Set the return object and exit */ |
| |
| walk_state->result_obj = return_desc; |
| } |
| |
| return_ACPI_STATUS(status); |
| } |