[RFC PATCH v3 09/22] objtool: arm64: Add basic definitions and compile

[madvenka@linux.microsoft.com]

From: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>

Add CFI definitions and Endianness for ARM64.

Add DYNAMIC_CHECK option for ARM64.

Provide stubs for arch_decode_instructions() and check() just to get
Objtool to build on ARM64.

Signed-off-by: Madhavan T. Venkataraman <madvenka@linux.microsoft.com>
---
 tools/objtool/Build                           |  1 +
 tools/objtool/Makefile                        |  6 +++++-
 tools/objtool/arch/arm64/Build                |  1 +
 tools/objtool/arch/arm64/decode.c             | 21 +++++++++++++++++++
 .../arch/arm64/include/arch/cfi_regs.h        | 13 ++++++++++++
 .../arch/arm64/include/arch/endianness.h      |  9 ++++++++
 tools/objtool/dcheck.c                        | 16 ++++++++++++++
 7 files changed, 66 insertions(+), 1 deletion(-)
 create mode 100644 tools/objtool/arch/arm64/Build
 create mode 100644 tools/objtool/arch/arm64/decode.c
 create mode 100644 tools/objtool/arch/arm64/include/arch/cfi_regs.h
 create mode 100644 tools/objtool/arch/arm64/include/arch/endianness.h
 create mode 100644 tools/objtool/dcheck.c

diff --git a/tools/objtool/Build b/tools/objtool/Build
index 974290dc4aac..fb0846b7d95e 100644
--- a/tools/objtool/Build
+++ b/tools/objtool/Build
@@ -4,6 +4,7 @@ objtool-y += weak.o
 
 objtool-$(STATIC_CHECK) += check.o
 objtool-$(STATIC_CHECK) += special.o
+objtool-$(DYNAMIC_CHECK) += dcheck.o
 objtool-y += builtin-check.o
 objtool-y += cfi.o
 objtool-y += insn.o
diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 797d1ea02db0..92583b82eb78 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -46,7 +46,11 @@ ifeq ($(SRCARCH),x86)
 	STATIC_CHECK := y
 endif
 
-export BUILD_ORC STATIC_CHECK
+ifeq ($(SRCARCH),arm64)
+	DYNAMIC_CHECK := y
+endif
+
+export BUILD_ORC STATIC_CHECK DYNAMIC_CHECK
 export srctree OUTPUT CFLAGS SRCARCH AWK
 include $(srctree)/tools/build/Makefile.include
 
diff --git a/tools/objtool/arch/arm64/Build b/tools/objtool/arch/arm64/Build
new file mode 100644
index 000000000000..3ff1f00c6a47
--- /dev/null
+++ b/tools/objtool/arch/arm64/Build
@@ -0,0 +1 @@
+objtool-y += decode.o
diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c
new file mode 100644
index 000000000000..69f851337537
--- /dev/null
+++ b/tools/objtool/arch/arm64/decode.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Author: Madhavan T. Venkataraman (madvenka@linux.microsoft.com)
+ *
+ * Copyright (C) 2022 Microsoft Corporation
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <objtool/check.h>
+
+int arch_decode_instruction(struct objtool_file *file,
+			    const struct section *sec,
+			    unsigned long offset, unsigned int maxlen,
+			    unsigned int *len, enum insn_type *type,
+			    unsigned long *immediate,
+			    struct list_head *ops_list)
+{
+	return 0;
+}
diff --git a/tools/objtool/arch/arm64/include/arch/cfi_regs.h b/tools/objtool/arch/arm64/include/arch/cfi_regs.h
new file mode 100644
index 000000000000..cff3b04d7248
--- /dev/null
+++ b/tools/objtool/arch/arm64/include/arch/cfi_regs.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef _OBJTOOL_CFI_REGS_H
+#define _OBJTOOL_CFI_REGS_H
+
+#define CFI_FP			29
+#define CFI_BP			CFI_FP
+#define CFI_RA			30
+#define CFI_SP			31
+
+#define CFI_NUM_REGS		32
+
+#endif /* _OBJTOOL_CFI_REGS_H */
diff --git a/tools/objtool/arch/arm64/include/arch/endianness.h b/tools/objtool/arch/arm64/include/arch/endianness.h
new file mode 100644
index 000000000000..7c362527da20
--- /dev/null
+++ b/tools/objtool/arch/arm64/include/arch/endianness.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _ARCH_ENDIANNESS_H
+#define _ARCH_ENDIANNESS_H
+
+#include <endian.h>
+
+#define __TARGET_BYTE_ORDER __LITTLE_ENDIAN
+
+#endif /* _ARCH_ENDIANNESS_H */
diff --git a/tools/objtool/dcheck.c b/tools/objtool/dcheck.c
new file mode 100644
index 000000000000..e2098c9ad282
--- /dev/null
+++ b/tools/objtool/dcheck.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <sys/mman.h>
+
+#include <objtool/objtool.h>
+
+int check(struct objtool_file *file)
+{
+	return 0;
+}
-- 
2.25.1