// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: exoparg3 - AML execution - opcodes with 3 arguments * * Copyright (C) 2000 - 2026, Intel Corp. * *****************************************************************************/ #include <acpi/acpi.h> #include "accommon.h" #include "acinterp.h" #include <acpi/acoutput.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_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) */ fatal.type = (u32)operand[0]->integer.value; fatal.code = (u32)operand[1]->integer.value; fatal.argument = (u32)operand[2]->integer.value; ACPI_BIOS_ERROR((AE_INFO, "Fatal ACPI BIOS error (Type 0x%X Code 0x%X Arg 0x%X)\n", fatal.type, fatal.code, fatal.argument)); /* Always signal the OS! */ acpi_os_signal(ACPI_SIGNAL_FATAL, &fatal); #ifndef ACPI_CONTINUE_ON_FATAL /* * Might return while OS is shutting down, so abort the AML execution * by returning an error. */ return_ACPI_STATUS(AE_ERROR); #else /* * The alstests require that the Fatal() opcode does not return an error. */ return_ACPI_STATUS(AE_OK); #endif 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")); return_ACPI_STATUS(AE_OK); default: ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", walk_state->opcode)); return_ACPI_STATUS(AE_AML_BAD_OPCODE); } } /******************************************************************************* * * 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 || (index + length) < index) { /* Check for overflow */ 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); }
