linux-kernel - [PATCH v2 3/6] unwind: add sframe v2 header

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Message-ID: <20250904223850.884188-4-dylanbhatch@google.com>
Date: Thu,  4 Sep 2025 22:38:47 +0000
From: Dylan Hatch <dylanbhatch@...gle.com>
To: Josh Poimboeuf <jpoimboe@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, 
	Indu Bhagat <indu.bhagat@...cle.com>, Peter Zijlstra <peterz@...radead.org>, 
	Will Deacon <will@...nel.org>, Catalin Marinas <catalin.marinas@....com>, 
	Jiri Kosina <jikos@...nel.org>
Cc: Dylan Hatch <dylanbhatch@...gle.com>, Roman Gushchin <roman.gushchin@...ux.dev>, 
	Weinan Liu <wnliu@...gle.com>, Mark Rutland <mark.rutland@....com>, Ian Rogers <irogers@...gle.com>, 
	linux-toolchains@...r.kernel.org, linux-kernel@...r.kernel.org, 
	live-patching@...r.kernel.org, joe.lawrence@...hat.com, 
	Puranjay Mohan <puranjay@...nel.org>, Song Liu <song@...nel.org>, 
	Prasanna Kumar T S M <ptsm@...ux.microsoft.com>
Subject: [PATCH v2 3/6] unwind: add sframe v2 header

Add sframe header so that we know how to access the sframe section
generated by compilers.

This is the sframe header file borrowed from the patchset [1]
Josh Poimboeuf according to sframe v2 spec [2].

[1]: https://lore.kernel.org/all/f27e8463783febfa0dabb0432a3dd6be8ad98412.1737511963.git.jpoimboe@kernel.org/
[2]: https://sourceware.org/binutils/docs/sframe-spec.html

Signed-off-by: Weinan Liu <wnliu@...gle.com>
Signed-off-by: Dylan Hatch <dylanbhatch@...gle.com>
Reviewed-by: Prasanna Kumar T S M <ptsm@...ux.microsoft.com>
---
 kernel/sframe.h | 75 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 kernel/sframe.h

diff --git a/kernel/sframe.h b/kernel/sframe.h
new file mode 100644
index 000000000000..e9045f980fee
--- /dev/null
+++ b/kernel/sframe.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * From https://www.sourceware.org/binutils/docs/sframe-spec.html
+ */
+#ifndef _SFRAME_H
+#define _SFRAME_H
+
+#include <linux/types.h>
+
+#define SFRAME_VERSION_1			1
+#define SFRAME_VERSION_2			2
+#define SFRAME_MAGIC				0xdee2
+
+#define SFRAME_F_FDE_SORTED			0x1
+#define SFRAME_F_FRAME_POINTER			0x2
+
+#define SFRAME_ABI_AARCH64_ENDIAN_BIG		1
+#define SFRAME_ABI_AARCH64_ENDIAN_LITTLE	2
+#define SFRAME_ABI_AMD64_ENDIAN_LITTLE		3
+
+#define SFRAME_FRE_TYPE_ADDR1			0
+#define SFRAME_FRE_TYPE_ADDR2			1
+#define SFRAME_FRE_TYPE_ADDR4			2
+
+#define SFRAME_FDE_TYPE_PCINC			0
+#define SFRAME_FDE_TYPE_PCMASK			1
+
+struct sframe_preamble {
+	u16	magic;
+	u8	version;
+	u8	flags;
+} __packed;
+
+struct sframe_header {
+	struct sframe_preamble preamble;
+	u8	abi_arch;
+	s8	cfa_fixed_fp_offset;
+	s8	cfa_fixed_ra_offset;
+	u8	auxhdr_len;
+	u32	num_fdes;
+	u32	num_fres;
+	u32	fre_len;
+	u32	fdes_off;
+	u32	fres_off;
+} __packed;
+
+#define SFRAME_HEADER_SIZE(header) \
+	((sizeof(struct sframe_header) + (header).auxhdr_len))
+
+#define SFRAME_AARCH64_PAUTH_KEY_A		0
+#define SFRAME_AARCH64_PAUTH_KEY_B		1
+
+struct sframe_fde {
+	s32	start_addr;
+	u32	func_size;
+	u32	fres_off;
+	u32	fres_num;
+	u8	info;
+	u8	rep_size;
+	u16 padding;
+} __packed;
+
+#define SFRAME_FUNC_FRE_TYPE(data)		(data & 0xf)
+#define SFRAME_FUNC_FDE_TYPE(data)		((data >> 4) & 0x1)
+#define SFRAME_FUNC_PAUTH_KEY(data)		((data >> 5) & 0x1)
+
+#define SFRAME_BASE_REG_FP			0
+#define SFRAME_BASE_REG_SP			1
+
+#define SFRAME_FRE_CFA_BASE_REG_ID(data)	(data & 0x1)
+#define SFRAME_FRE_OFFSET_COUNT(data)		((data >> 1) & 0xf)
+#define SFRAME_FRE_OFFSET_SIZE(data)		((data >> 5) & 0x3)
+#define SFRAME_FRE_MANGLED_RA_P(data)		((data >> 7) & 0x1)
+
+#endif /* _SFRAME_H */
-- 
2.51.0.355.g5224444f11-goog