1/****************************************************************************** 2 * 3 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments 4 * 5 *****************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2016, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44#include <acpi/acpi.h> 45#include "accommon.h" 46#include "acinterp.h" 47#include "acparser.h" 48#include "amlcode.h" 49 50#define _COMPONENT ACPI_EXECUTER 51ACPI_MODULE_NAME("exoparg3") 52 53/*! 54 * Naming convention for AML interpreter execution routines. 55 * 56 * The routines that begin execution of AML opcodes are named with a common 57 * convention based upon the number of arguments, the number of target operands, 58 * and whether or not a value is returned: 59 * 60 * AcpiExOpcode_xA_yT_zR 61 * 62 * Where: 63 * 64 * xA - ARGUMENTS: The number of arguments (input operands) that are 65 * required for this opcode type (1 through 6 args). 66 * yT - TARGETS: The number of targets (output operands) that are required 67 * for this opcode type (0, 1, or 2 targets). 68 * zR - RETURN VALUE: Indicates whether this opcode type returns a value 69 * as the function return (0 or 1). 70 * 71 * The AcpiExOpcode* functions are called via the Dispatcher component with 72 * fully resolved operands. 73!*/ 74/******************************************************************************* 75 * 76 * FUNCTION: acpi_ex_opcode_3A_0T_0R 77 * 78 * PARAMETERS: walk_state - Current walk state 79 * 80 * RETURN: Status 81 * 82 * DESCRIPTION: Execute Triadic operator (3 operands) 83 * 84 ******************************************************************************/ 85acpi_status acpi_ex_opcode_3A_0T_0R(struct acpi_walk_state *walk_state) 86{ 87 union acpi_operand_object **operand = &walk_state->operands[0]; 88 struct acpi_signal_fatal_info *fatal; 89 acpi_status status = AE_OK; 90 91 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_0T_0R, 92 acpi_ps_get_opcode_name(walk_state->opcode)); 93 94 switch (walk_state->opcode) { 95 case AML_FATAL_OP: /* Fatal (fatal_type fatal_code fatal_arg) */ 96 97 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 98 "FatalOp: Type %X Code %X Arg %X " 99 "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n", 100 (u32)operand[0]->integer.value, 101 (u32)operand[1]->integer.value, 102 (u32)operand[2]->integer.value)); 103 104 fatal = ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info)); 105 if (fatal) { 106 fatal->type = (u32) operand[0]->integer.value; 107 fatal->code = (u32) operand[1]->integer.value; 108 fatal->argument = (u32) operand[2]->integer.value; 109 } 110 111 /* Always signal the OS! */ 112 113 status = acpi_os_signal(ACPI_SIGNAL_FATAL, fatal); 114 115 /* Might return while OS is shutting down, just continue */ 116 117 ACPI_FREE(fatal); 118 goto cleanup; 119 120 case AML_EXTERNAL_OP: 121 /* 122 * If the interpreter sees this opcode, just ignore it. The External 123 * op is intended for use by disassemblers in order to properly 124 * disassemble control method invocations. The opcode or group of 125 * opcodes should be surrounded by an "if (0)" clause to ensure that 126 * AML interpreters never see the opcode. 127 */ 128 status = AE_OK; 129 goto cleanup; 130 131 default: 132 133 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 134 walk_state->opcode)); 135 136 status = AE_AML_BAD_OPCODE; 137 goto cleanup; 138 } 139 140cleanup: 141 142 return_ACPI_STATUS(status); 143} 144 145/******************************************************************************* 146 * 147 * FUNCTION: acpi_ex_opcode_3A_1T_1R 148 * 149 * PARAMETERS: walk_state - Current walk state 150 * 151 * RETURN: Status 152 * 153 * DESCRIPTION: Execute Triadic operator (3 operands) 154 * 155 ******************************************************************************/ 156 157acpi_status acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state *walk_state) 158{ 159 union acpi_operand_object **operand = &walk_state->operands[0]; 160 union acpi_operand_object *return_desc = NULL; 161 char *buffer = NULL; 162 acpi_status status = AE_OK; 163 u64 index; 164 acpi_size length; 165 166 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R, 167 acpi_ps_get_opcode_name(walk_state->opcode)); 168 169 switch (walk_state->opcode) { 170 case AML_MID_OP: /* Mid (Source[0], Index[1], Length[2], Result[3]) */ 171 /* 172 * Create the return object. The Source operand is guaranteed to be 173 * either a String or a Buffer, so just use its type. 174 */ 175 return_desc = acpi_ut_create_internal_object((operand[0])-> 176 common.type); 177 if (!return_desc) { 178 status = AE_NO_MEMORY; 179 goto cleanup; 180 } 181 182 /* Get the Integer values from the objects */ 183 184 index = operand[1]->integer.value; 185 length = (acpi_size) operand[2]->integer.value; 186 187 /* 188 * If the index is beyond the length of the String/Buffer, or if the 189 * requested length is zero, return a zero-length String/Buffer 190 */ 191 if (index >= operand[0]->string.length) { 192 length = 0; 193 } 194 195 /* Truncate request if larger than the actual String/Buffer */ 196 197 else if ((index + length) > operand[0]->string.length) { 198 length = 199 (acpi_size) operand[0]->string.length - 200 (acpi_size) index; 201 } 202 203 /* Strings always have a sub-pointer, not so for buffers */ 204 205 switch ((operand[0])->common.type) { 206 case ACPI_TYPE_STRING: 207 208 /* Always allocate a new buffer for the String */ 209 210 buffer = ACPI_ALLOCATE_ZEROED((acpi_size) length + 1); 211 if (!buffer) { 212 status = AE_NO_MEMORY; 213 goto cleanup; 214 } 215 break; 216 217 case ACPI_TYPE_BUFFER: 218 219 /* If the requested length is zero, don't allocate a buffer */ 220 221 if (length > 0) { 222 223 /* Allocate a new buffer for the Buffer */ 224 225 buffer = ACPI_ALLOCATE_ZEROED(length); 226 if (!buffer) { 227 status = AE_NO_MEMORY; 228 goto cleanup; 229 } 230 } 231 break; 232 233 default: /* Should not happen */ 234 235 status = AE_AML_OPERAND_TYPE; 236 goto cleanup; 237 } 238 239 if (buffer) { 240 241 /* We have a buffer, copy the portion requested */ 242 243 memcpy(buffer, 244 operand[0]->string.pointer + index, length); 245 } 246 247 /* Set the length of the new String/Buffer */ 248 249 return_desc->string.pointer = buffer; 250 return_desc->string.length = (u32) length; 251 252 /* Mark buffer initialized */ 253 254 return_desc->buffer.flags |= AOPOBJ_DATA_VALID; 255 break; 256 257 default: 258 259 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 260 walk_state->opcode)); 261 262 status = AE_AML_BAD_OPCODE; 263 goto cleanup; 264 } 265 266 /* Store the result in the target */ 267 268 status = acpi_ex_store(return_desc, operand[3], walk_state); 269 270cleanup: 271 272 /* Delete return object on error */ 273 274 if (ACPI_FAILURE(status) || walk_state->result_obj) { 275 acpi_ut_remove_reference(return_desc); 276 walk_state->result_obj = NULL; 277 } else { 278 /* Set the return object and exit */ 279 280 walk_state->result_obj = return_desc; 281 } 282 283 return_ACPI_STATUS(status); 284} 285