linux-kernel - [PATCH v5 17/33] objtool: arm64: Add unwind

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Date:   Wed, 22 Jun 2022 23:49:04 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kbuild@...r.kernel.org>, <live-patching@...r.kernel.org>
CC:     <jpoimboe@...nel.org>, <peterz@...radead.org>,
        <catalin.marinas@....com>, <will@...nel.org>,
        <masahiroy@...nel.org>, <michal.lkml@...kovi.net>,
        <ndesaulniers@...gle.com>, <mark.rutland@....com>,
        <pasha.tatashin@...een.com>, <broonie@...nel.org>,
        <chenzhongjin@...wei.com>, <rmk+kernel@...linux.org.uk>,
        <madvenka@...ux.microsoft.com>, <christophe.leroy@...roup.eu>
Subject: [PATCH v5 17/33] objtool: arm64: Add unwind_hint support

Provide unwind hint defines for arm64 and objtool hint decoding.

Signed-off-by: Julien Thierry <jthierry@...hat.com>
Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
 arch/arm64/include/asm/unwind_hints.h       | 26 +++++++++++++++++++++
 tools/arch/arm64/include/asm/unwind_hints.h | 26 +++++++++++++++++++++
 tools/objtool/arch/arm64/decode.c           | 14 ++++++++++-
 3 files changed, 65 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/include/asm/unwind_hints.h
 create mode 100644 tools/arch/arm64/include/asm/unwind_hints.h

diff --git a/arch/arm64/include/asm/unwind_hints.h b/arch/arm64/include/asm/unwind_hints.h
new file mode 100644
index 000000000000..ffee9472b30d
--- /dev/null
+++ b/arch/arm64/include/asm/unwind_hints.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ASM_UNWIND_HINTS_H
+#define __ASM_UNWIND_HINTS_H
+
+#include <linux/objtool.h>
+
+#include "orc_types.h"
+
+#ifdef __ASSEMBLY__
+
+.macro UNWIND_HINT_EMPTY
+	UNWIND_HINT sp_reg=ORC_REG_UNDEFINED type=UNWIND_HINT_TYPE_CALL end=1
+.endm
+
+.macro UNWIND_HINT_FUNC sp_offset=0
+	UNWIND_HINT sp_reg=ORC_REG_SP sp_offset=\sp_offset type=UNWIND_HINT_TYPE_CALL
+.endm
+
+.macro UNWIND_HINT_REGS base=ORC_REG_SP offset=0
+	UNWIND_HINT sp_reg=\base sp_offset=\offset type=UNWIND_HINT_TYPE_REGS
+.endm
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_UNWIND_HINTS_H */
diff --git a/tools/arch/arm64/include/asm/unwind_hints.h b/tools/arch/arm64/include/asm/unwind_hints.h
new file mode 100644
index 000000000000..ffee9472b30d
--- /dev/null
+++ b/tools/arch/arm64/include/asm/unwind_hints.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ASM_UNWIND_HINTS_H
+#define __ASM_UNWIND_HINTS_H
+
+#include <linux/objtool.h>
+
+#include "orc_types.h"
+
+#ifdef __ASSEMBLY__
+
+.macro UNWIND_HINT_EMPTY
+	UNWIND_HINT sp_reg=ORC_REG_UNDEFINED type=UNWIND_HINT_TYPE_CALL end=1
+.endm
+
+.macro UNWIND_HINT_FUNC sp_offset=0
+	UNWIND_HINT sp_reg=ORC_REG_SP sp_offset=\sp_offset type=UNWIND_HINT_TYPE_CALL
+.endm
+
+.macro UNWIND_HINT_REGS base=ORC_REG_SP offset=0
+	UNWIND_HINT sp_reg=\base sp_offset=\offset type=UNWIND_HINT_TYPE_REGS
+.endm
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_UNWIND_HINTS_H */
diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c
index 37e42148dbe0..aa8d27c2bac9 100644
--- a/tools/objtool/arch/arm64/decode.c
+++ b/tools/objtool/arch/arm64/decode.c
@@ -5,6 +5,7 @@
 #include <stdint.h>
 
 #include <asm/insn.h>
+#include <asm/unwind_hints.h>
 
 #include <objtool/check.h>
 #include <objtool/arch.h>
@@ -176,7 +177,18 @@ static int is_arm64(const struct elf *elf)
 
 int arch_decode_hint_reg(u8 sp_reg, int *base)
 {
-	return -1;
+	switch (sp_reg) {
+	case ORC_REG_UNDEFINED:
+		*base = CFI_UNDEFINED;
+		break;
+	case ORC_REG_SP:
+		*base = CFI_SP;
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
 }
 
 static inline void make_add_op(enum aarch64_insn_register dest,
-- 
2.17.1