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+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: exoparg3 - AML execution - opcodes with 3 arguments
+ *
+ * Copyright (C) 2000 - 2020, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acinterp.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_status status = AE_OK;
+
+ 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) */
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "FatalOp: Type %X Code %X Arg %X "
+ "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
+ (u32)operand[0]->integer.value,
+ (u32)operand[1]->integer.value,
+ (u32)operand[2]->integer.value));
+
+ fatal = ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info));
+ if (fatal) {
+ fatal->type = (u32)operand[0]->integer.value;
+ fatal->code = (u32)operand[1]->integer.value;
+ fatal->argument = (u32)operand[2]->integer.value;
+ }
+
+ /* Always signal the OS! */
+
+ status = acpi_os_signal(ACPI_SIGNAL_FATAL, fatal);
+
+ /* Might return while OS is shutting down, just continue */
+
+ ACPI_FREE(fatal);
+ goto cleanup;
+
+ 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"));
+ status = AE_OK;
+ goto cleanup;
+
+ default:
+
+ ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
+ walk_state->opcode));
+
+ status = AE_AML_BAD_OPCODE;
+ goto cleanup;
+ }
+
+cleanup:
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * 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) {
+ 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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-16 21:56:23 +0000