ACPICA: Debugger: Cleanup interface to the AML disassembler

If the disassembler is configured out (such as when the debugger
is part of a kernel), these debugger commands are disabled:
    List
    Disassemble
Further, the Debug (single-step) command is simplified because
each line of code cannot be disassembled.

Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

3 files changed, 22 insertions, 6 deletions

diff --git a/drivers/acpi/acpica/dbinput.c b/drivers/acpi/acpica/dbinput.c
index 556ff59bbbfc..3e5f95390f0d 100644
--- a/drivers/acpi/acpica/dbinput.c
+++ b/drivers/acpi/acpica/dbinput.c
@@ -763,7 +763,12 @@ acpi_db_command_dispatch(char *input_buffer,
 	case CMD_DISASSEMBLE:
 	case CMD_DISASM:
 
+#ifdef ACPI_DISASSEMBLER
 		(void)acpi_db_disassemble_method(acpi_gbl_db_args[1]);
+#else
+		acpi_os_printf
+		    ("The AML Disassembler is not configured/present\n");
+#endif
 		break;
 
 	case CMD_DUMP:
@@ -872,7 +877,12 @@ acpi_db_command_dispatch(char *input_buffer,
 
 	case CMD_LIST:
 
+#ifdef ACPI_DISASSEMBLER
 		acpi_db_disassemble_aml(acpi_gbl_db_args[1], op);
+#else
+		acpi_os_printf
+		    ("The AML Disassembler is not configured/present\n");
+#endif
 		break;
 
 	case CMD_LOCKS:
diff --git a/drivers/acpi/acpica/dbmethod.c b/drivers/acpi/acpica/dbmethod.c
index 9fcecf104ba0..d8b7a0fe92ec 100644
--- a/drivers/acpi/acpica/dbmethod.c
+++ b/drivers/acpi/acpica/dbmethod.c
@@ -216,6 +216,7 @@ cleanup:
 	acpi_ut_remove_reference(obj_desc);
 }
 
+#ifdef ACPI_DISASSEMBLER
 /*******************************************************************************
  *
  * FUNCTION:    acpi_db_disassemble_aml
@@ -242,9 +243,8 @@ void acpi_db_disassemble_aml(char *statements, union acpi_parse_object *op)
 	if (statements) {
 		num_statements = strtoul(statements, NULL, 0);
 	}
-#ifdef ACPI_DISASSEMBLER
+
 	acpi_dm_disassemble(NULL, op, num_statements);
-#endif
 }
 
 /*******************************************************************************
@@ -317,8 +317,6 @@ acpi_status acpi_db_disassemble_method(char *name)
 	walk_state->parse_flags |= ACPI_PARSE_DISASSEMBLE;
 
 	status = acpi_ps_parse_aml(walk_state);
-
-#ifdef ACPI_DISASSEMBLER
 	(void)acpi_dm_parse_deferred_ops(op);
 
 	/* Now we can disassemble the method */
@@ -326,7 +324,6 @@ acpi_status acpi_db_disassemble_method(char *name)
 	acpi_gbl_dm_opt_verbose = FALSE;
 	acpi_dm_disassemble(NULL, op, 0);
 	acpi_gbl_dm_opt_verbose = TRUE;
-#endif
 
 	acpi_ps_delete_parse_tree(op);
 
@@ -337,6 +334,7 @@ acpi_status acpi_db_disassemble_method(char *name)
 	acpi_ut_release_owner_id(&obj_desc->method.owner_id);
 	return (AE_OK);
 }
+#endif
 
 /*******************************************************************************
  *
diff --git a/drivers/acpi/acpica/dbxface.c b/drivers/acpi/acpica/dbxface.c
index 4647aa8efecb..f2526726daf6 100644
--- a/drivers/acpi/acpica/dbxface.c
+++ b/drivers/acpi/acpica/dbxface.c
@@ -10,6 +10,7 @@
 #include "amlcode.h"
 #include "acdebug.h"
 #include "acinterp.h"
+#include "acparser.h"
 
 #define _COMPONENT          ACPI_CA_DEBUGGER
 ACPI_MODULE_NAME("dbxface")
@@ -262,10 +263,17 @@ acpi_db_single_step(struct acpi_walk_state *walk_state,
 			}
 		}
 
-		/* Now we can display it */
+		/* Now we can disassemble and display it */
 
 #ifdef ACPI_DISASSEMBLER
 		acpi_dm_disassemble(walk_state, display_op, ACPI_UINT32_MAX);
+#else
+		/*
+		 * The AML Disassembler is not configured - at least we can
+		 * display the opcode value and name
+		 */
+		acpi_os_printf("AML Opcode: %4.4X %s\n", op->common.aml_opcode,
+			       acpi_ps_get_opcode_name(op->common.aml_opcode));
 #endif
 
 		if ((op->common.aml_opcode == AML_IF_OP) ||