1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments 5 * 6 * Copyright (C) 2000 - 2019, 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_EXECUTER 17 ACPI_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 common 23 * 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_zR 27 * 28 * Where: 29 * 30 * xA - ARGUMENTS: The number of arguments (input operands) that are 31 * required for this opcode type (1 through 6 args). 32 * yT - TARGETS: The number of targets (output operands) that are required 33 * for this opcode type (0, 1, or 2 targets). 34 * zR - RETURN VALUE: Indicates whether this opcode type returns a value 35 * as the function return (0 or 1). 36 * 37 * The AcpiExOpcode* functions are called via the Dispatcher component with 38 * fully resolved operands. 39 !*/ 40 /******************************************************************************* 41 * 42 * FUNCTION: acpi_ex_opcode_3A_0T_0R 43 * 44 * PARAMETERS: walk_state - Current walk state 45 * 46 * RETURN: Status 47 * 48 * DESCRIPTION: Execute Triadic operator (3 operands) 49 * 50 ******************************************************************************/ 51 acpi_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 External 89 * op is intended for use by disassemblers in order to properly 90 * disassemble control method invocations. The opcode or group of 91 * opcodes should be surrounded by an "if (0)" clause to ensure that 92 * AML interpreters never see the opcode. Thus, something is 93 * 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 } 107 108 cleanup: 109 110 return_ACPI_STATUS(status); 111 } 112 113 /******************************************************************************* 114 * 115 * FUNCTION: acpi_ex_opcode_3A_1T_1R 116 * 117 * PARAMETERS: walk_state - Current walk state 118 * 119 * RETURN: Status 120 * 121 * DESCRIPTION: Execute Triadic operator (3 operands) 122 * 123 ******************************************************************************/ 124 125 acpi_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 be 141 * 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 the 157 * requested length is zero, return a zero-length String/Buffer 158 */ 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); 237 238 cleanup: 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