ACPICA: changed order of interpretation of operand objects

The interpreter now evaluates operands in the order that they
appear (both in the
 AML and ASL), instead of in reverse order. This previously
 caused subtle incompatibilities with the MS interpreter as well
 as being non-intuitive.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 49 insertions, 2 deletions

diff --git a/drivers/acpi/parser/psloop.c b/drivers/acpi/parser/psloop.c
index 266dd0c..4348b05 100644
--- a/drivers/acpi/parser/psloop.c
+++ b/drivers/acpi/parser/psloop.c
@@ -182,6 +182,7 @@ acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
 	ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state);
 
 	unnamed_op->common.value.arg = NULL;
+	unnamed_op->common.arg_list_length = 0;
 	unnamed_op->common.aml_opcode = walk_state->opcode;
 
 	/*
@@ -280,6 +281,9 @@ acpi_ps_create_op(struct acpi_walk_state *walk_state,
 	acpi_status status = AE_OK;
 	union acpi_parse_object *op;
 	union acpi_parse_object *named_op = NULL;
+	union acpi_parse_object *parent_scope;
+	u8 argument_count;
+	const struct acpi_opcode_info *op_info;
 
 	ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state);
 
@@ -320,8 +324,23 @@ acpi_ps_create_op(struct acpi_walk_state *walk_state,
 		op->named.length = 0;
 	}
 
-	acpi_ps_append_arg(acpi_ps_get_parent_scope
-			   (&(walk_state->parser_state)), op);
+	parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state));
+	acpi_ps_append_arg(parent_scope, op);
+
+	if (parent_scope) {
+		op_info =
+		    acpi_ps_get_opcode_info(parent_scope->common.aml_opcode);
+		if (op_info->flags & AML_HAS_TARGET) {
+			argument_count =
+			    acpi_ps_get_argument_count(op_info->type);
+			if (parent_scope->common.arg_list_length >
+			    argument_count) {
+				op->common.flags |= ACPI_PARSEOP_TARGET;
+			}
+		} else if (parent_scope->common.aml_opcode == AML_INCREMENT_OP) {
+			op->common.flags |= ACPI_PARSEOP_TARGET;
+		}
+	}
 
 	if (walk_state->descending_callback != NULL) {
 		/*
diff --git a/drivers/acpi/parser/psopcode.c b/drivers/acpi/parser/psopcode.c
index 9296e86..3bf8105 100644
--- a/drivers/acpi/parser/psopcode.c
+++ b/drivers/acpi/parser/psopcode.c
@@ -49,6 +49,8 @@
 #define _COMPONENT          ACPI_PARSER
 ACPI_MODULE_NAME("psopcode")
 
+const u8 acpi_gbl_argument_count[] = { 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 6 };
+
 /*******************************************************************************
  *
  * NAME:        acpi_gbl_aml_op_info
@@ -59,6 +61,7 @@ ACPI_MODULE_NAME("psopcode")
  *              the operand type.
  *
  ******************************************************************************/
+
 /*
  * Summary of opcode types/flags
  *
@@ -176,6 +179,7 @@ ACPI_MODULE_NAME("psopcode")
 	AML_CREATE_QWORD_FIELD_OP
 
  ******************************************************************************/
+
 /*
  * Master Opcode information table.  A summary of everything we know about each
  * opcode, all in one place.
@@ -779,3 +783,25 @@ char *acpi_ps_get_opcode_name(u16 opcode)
 
 #endif
 }
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ps_get_argument_count
+ *
+ * PARAMETERS:  op_type             - Type associated with the AML opcode
+ *
+ * RETURN:      Argument count
+ *
+ * DESCRIPTION: Obtain the number of expected arguments for an AML opcode
+ *
+ ******************************************************************************/
+
+u8 acpi_ps_get_argument_count(u32 op_type)
+{
+
+	if (op_type <= AML_TYPE_EXEC_6A_0T_1R) {
+		return (acpi_gbl_argument_count[op_type]);
+	}
+
+	return (0);
+}
diff --git a/drivers/acpi/parser/pstree.c b/drivers/acpi/parser/pstree.c
index 966e7ea..0e1a322 100644
--- a/drivers/acpi/parser/pstree.c
+++ b/drivers/acpi/parser/pstree.c
@@ -171,6 +171,8 @@ acpi_ps_append_arg(union acpi_parse_object *op, union acpi_parse_object *arg)
 	while (arg) {
 		arg->common.parent = op;
 		arg = arg->common.next;
+
+		op->common.arg_list_length++;
 	}
 }