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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.02/******************************************************************************3 *4 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments5 *6 * Copyright (C) 2000 - 2023, Intel Corp.7 *8 *****************************************************************************/9 10#include <acpi/acpi.h>11#include "accommon.h"12#include "acinterp.h"13#include "acparser.h"14#include "amlcode.h"15 16#define _COMPONENT ACPI_EXECUTER17ACPI_MODULE_NAME("exoparg3")18 19/*!20 * Naming convention for AML interpreter execution routines.21 *22 * The routines that begin execution of AML opcodes are named with a common23 * convention based upon the number of arguments, the number of target operands,24 * and whether or not a value is returned:25 *26 * AcpiExOpcode_xA_yT_zR27 *28 * Where:29 *30 * xA - ARGUMENTS: The number of arguments (input operands) that are31 * required for this opcode type (1 through 6 args).32 * yT - TARGETS: The number of targets (output operands) that are required33 * for this opcode type (0, 1, or 2 targets).34 * zR - RETURN VALUE: Indicates whether this opcode type returns a value35 * as the function return (0 or 1).36 *37 * The AcpiExOpcode* functions are called via the Dispatcher component with38 * fully resolved operands.39!*/40/*******************************************************************************41 *42 * FUNCTION: acpi_ex_opcode_3A_0T_0R43 *44 * PARAMETERS: walk_state - Current walk state45 *46 * RETURN: Status47 *48 * DESCRIPTION: Execute Triadic operator (3 operands)49 *50 ******************************************************************************/51acpi_status acpi_ex_opcode_3A_0T_0R(struct acpi_walk_state *walk_state)52{53 union acpi_operand_object **operand = &walk_state->operands[0];54 struct acpi_signal_fatal_info *fatal;55 acpi_status status = AE_OK;56 57 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_0T_0R,58 acpi_ps_get_opcode_name(walk_state->opcode));59 60 switch (walk_state->opcode) {61 case AML_FATAL_OP: /* Fatal (fatal_type fatal_code fatal_arg) */62 63 ACPI_DEBUG_PRINT((ACPI_DB_INFO,64 "FatalOp: Type %X Code %X Arg %X "65 "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",66 (u32)operand[0]->integer.value,67 (u32)operand[1]->integer.value,68 (u32)operand[2]->integer.value));69 70 fatal = ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info));71 if (fatal) {72 fatal->type = (u32) operand[0]->integer.value;73 fatal->code = (u32) operand[1]->integer.value;74 fatal->argument = (u32) operand[2]->integer.value;75 }76 77 /* Always signal the OS! */78 79 status = acpi_os_signal(ACPI_SIGNAL_FATAL, fatal);80 81 /* Might return while OS is shutting down, just continue */82 83 ACPI_FREE(fatal);84 goto cleanup;85 86 case AML_EXTERNAL_OP:87 /*88 * If the interpreter sees this opcode, just ignore it. The External89 * op is intended for use by disassemblers in order to properly90 * disassemble control method invocations. The opcode or group of91 * opcodes should be surrounded by an "if (0)" clause to ensure that92 * AML interpreters never see the opcode. Thus, something is93 * wrong if an external opcode ever gets here.94 */95 ACPI_ERROR((AE_INFO, "Executed External Op"));96 status = AE_OK;97 goto cleanup;98 99 default:100 101 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",102 walk_state->opcode));103 104 status = AE_AML_BAD_OPCODE;105 goto cleanup;106 }107 108cleanup:109 110 return_ACPI_STATUS(status);111}112 113/*******************************************************************************114 *115 * FUNCTION: acpi_ex_opcode_3A_1T_1R116 *117 * PARAMETERS: walk_state - Current walk state118 *119 * RETURN: Status120 *121 * DESCRIPTION: Execute Triadic operator (3 operands)122 *123 ******************************************************************************/124 125acpi_status acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state *walk_state)126{127 union acpi_operand_object **operand = &walk_state->operands[0];128 union acpi_operand_object *return_desc = NULL;129 char *buffer = NULL;130 acpi_status status = AE_OK;131 u64 index;132 acpi_size length;133 134 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R,135 acpi_ps_get_opcode_name(walk_state->opcode));136 137 switch (walk_state->opcode) {138 case AML_MID_OP: /* Mid (Source[0], Index[1], Length[2], Result[3]) */139 /*140 * Create the return object. The Source operand is guaranteed to be141 * either a String or a Buffer, so just use its type.142 */143 return_desc = acpi_ut_create_internal_object((operand[0])->144 common.type);145 if (!return_desc) {146 status = AE_NO_MEMORY;147 goto cleanup;148 }149 150 /* Get the Integer values from the objects */151 152 index = operand[1]->integer.value;153 length = (acpi_size)operand[2]->integer.value;154 155 /*156 * If the index is beyond the length of the String/Buffer, or if the157 * requested length is zero, return a zero-length String/Buffer158 */159 if (index >= operand[0]->string.length) {160 length = 0;161 }162 163 /* Truncate request if larger than the actual String/Buffer */164 165 else if ((index + length) > operand[0]->string.length) {166 length =167 (acpi_size)operand[0]->string.length -168 (acpi_size)index;169 }170 171 /* Strings always have a sub-pointer, not so for buffers */172 173 switch ((operand[0])->common.type) {174 case ACPI_TYPE_STRING:175 176 /* Always allocate a new buffer for the String */177 178 buffer = ACPI_ALLOCATE_ZEROED((acpi_size)length + 1);179 if (!buffer) {180 status = AE_NO_MEMORY;181 goto cleanup;182 }183 break;184 185 case ACPI_TYPE_BUFFER:186 187 /* If the requested length is zero, don't allocate a buffer */188 189 if (length > 0) {190 191 /* Allocate a new buffer for the Buffer */192 193 buffer = ACPI_ALLOCATE_ZEROED(length);194 if (!buffer) {195 status = AE_NO_MEMORY;196 goto cleanup;197 }198 }199 break;200 201 default: /* Should not happen */202 203 status = AE_AML_OPERAND_TYPE;204 goto cleanup;205 }206 207 if (buffer) {208 209 /* We have a buffer, copy the portion requested */210 211 memcpy(buffer,212 operand[0]->string.pointer + index, length);213 }214 215 /* Set the length of the new String/Buffer */216 217 return_desc->string.pointer = buffer;218 return_desc->string.length = (u32) length;219 220 /* Mark buffer initialized */221 222 return_desc->buffer.flags |= AOPOBJ_DATA_VALID;223 break;224 225 default:226 227 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",228 walk_state->opcode));229 230 status = AE_AML_BAD_OPCODE;231 goto cleanup;232 }233 234 /* Store the result in the target */235 236 status = acpi_ex_store(return_desc, operand[3], walk_state);237 238cleanup:239 240 /* Delete return object on error */241 242 if (ACPI_FAILURE(status) || walk_state->result_obj) {243 acpi_ut_remove_reference(return_desc);244 walk_state->result_obj = NULL;245 } else {246 /* Set the return object and exit */247 248 walk_state->result_obj = return_desc;249 }250 251 return_ACPI_STATUS(status);252}253