1 /****************************************************************************** 2 * 3 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2017, 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 51 ACPI_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 ******************************************************************************/ 85 acpi_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. Thus, something is 127 * wrong if an external opcode ever gets here. 128 */ 129 ACPI_ERROR((AE_INFO, "Executed External Op")); 130 status = AE_OK; 131 goto cleanup; 132 133 default: 134 135 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 136 walk_state->opcode)); 137 138 status = AE_AML_BAD_OPCODE; 139 goto cleanup; 140 } 141 142 cleanup: 143 144 return_ACPI_STATUS(status); 145 } 146 147 /******************************************************************************* 148 * 149 * FUNCTION: acpi_ex_opcode_3A_1T_1R 150 * 151 * PARAMETERS: walk_state - Current walk state 152 * 153 * RETURN: Status 154 * 155 * DESCRIPTION: Execute Triadic operator (3 operands) 156 * 157 ******************************************************************************/ 158 159 acpi_status acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state *walk_state) 160 { 161 union acpi_operand_object **operand = &walk_state->operands[0]; 162 union acpi_operand_object *return_desc = NULL; 163 char *buffer = NULL; 164 acpi_status status = AE_OK; 165 u64 index; 166 acpi_size length; 167 168 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R, 169 acpi_ps_get_opcode_name(walk_state->opcode)); 170 171 switch (walk_state->opcode) { 172 case AML_MID_OP: /* Mid (Source[0], Index[1], Length[2], Result[3]) */ 173 /* 174 * Create the return object. The Source operand is guaranteed to be 175 * either a String or a Buffer, so just use its type. 176 */ 177 return_desc = acpi_ut_create_internal_object((operand[0])-> 178 common.type); 179 if (!return_desc) { 180 status = AE_NO_MEMORY; 181 goto cleanup; 182 } 183 184 /* Get the Integer values from the objects */ 185 186 index = operand[1]->integer.value; 187 length = (acpi_size)operand[2]->integer.value; 188 189 /* 190 * If the index is beyond the length of the String/Buffer, or if the 191 * requested length is zero, return a zero-length String/Buffer 192 */ 193 if (index >= operand[0]->string.length) { 194 length = 0; 195 } 196 197 /* Truncate request if larger than the actual String/Buffer */ 198 199 else if ((index + length) > operand[0]->string.length) { 200 length = 201 (acpi_size)operand[0]->string.length - 202 (acpi_size)index; 203 } 204 205 /* Strings always have a sub-pointer, not so for buffers */ 206 207 switch ((operand[0])->common.type) { 208 case ACPI_TYPE_STRING: 209 210 /* Always allocate a new buffer for the String */ 211 212 buffer = ACPI_ALLOCATE_ZEROED((acpi_size)length + 1); 213 if (!buffer) { 214 status = AE_NO_MEMORY; 215 goto cleanup; 216 } 217 break; 218 219 case ACPI_TYPE_BUFFER: 220 221 /* If the requested length is zero, don't allocate a buffer */ 222 223 if (length > 0) { 224 225 /* Allocate a new buffer for the Buffer */ 226 227 buffer = ACPI_ALLOCATE_ZEROED(length); 228 if (!buffer) { 229 status = AE_NO_MEMORY; 230 goto cleanup; 231 } 232 } 233 break; 234 235 default: /* Should not happen */ 236 237 status = AE_AML_OPERAND_TYPE; 238 goto cleanup; 239 } 240 241 if (buffer) { 242 243 /* We have a buffer, copy the portion requested */ 244 245 memcpy(buffer, 246 operand[0]->string.pointer + index, length); 247 } 248 249 /* Set the length of the new String/Buffer */ 250 251 return_desc->string.pointer = buffer; 252 return_desc->string.length = (u32) length; 253 254 /* Mark buffer initialized */ 255 256 return_desc->buffer.flags |= AOPOBJ_DATA_VALID; 257 break; 258 259 default: 260 261 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 262 walk_state->opcode)); 263 264 status = AE_AML_BAD_OPCODE; 265 goto cleanup; 266 } 267 268 /* Store the result in the target */ 269 270 status = acpi_ex_store(return_desc, operand[3], walk_state); 271 272 cleanup: 273 274 /* Delete return object on error */ 275 276 if (ACPI_FAILURE(status) || walk_state->result_obj) { 277 acpi_ut_remove_reference(return_desc); 278 walk_state->result_obj = NULL; 279 } else { 280 /* Set the return object and exit */ 281 282 walk_state->result_obj = return_desc; 283 } 284 285 return_ACPI_STATUS(status); 286 } 287