linux-kernel - [PATCH v2 02/11] unwind/x86: Add HAVE_USER

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Message-ID: <82ef19a767cb75e76a985ecc0d47a39400b4fdf5.1726268190.git.jpoimboe@kernel.org>
Date: Sat, 14 Sep 2024 01:02:04 +0200
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org,
	Indu Bhagat <indu.bhagat@...cle.com>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-perf-users@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	linux-toolchains@...r.kernel.org,
	Jordan Rome <jordalgo@...a.com>,
	Sam James <sam@...too.org>
Subject: [PATCH v2 02/11] unwind/x86: Add HAVE_USER_UNWIND

Use ARCH_INIT_USER_FP_FRAME to describe how frame pointers are unwound
on x86, and enable HAVE_USER_UNWIND accordinlgy so the user unwind
interfaces can be used.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 arch/x86/Kconfig                   |  1 +
 arch/x86/include/asm/user_unwind.h | 11 +++++++++++
 2 files changed, 12 insertions(+)
 create mode 100644 arch/x86/include/asm/user_unwind.h

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 007bab9f2a0e..266edff59058 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -286,6 +286,7 @@ config X86
 	select HAVE_UACCESS_VALIDATION		if HAVE_OBJTOOL
 	select HAVE_UNSTABLE_SCHED_CLOCK
 	select HAVE_USER_RETURN_NOTIFIER
+	select HAVE_USER_UNWIND
 	select HAVE_GENERIC_VDSO
 	select VDSO_GETRANDOM			if X86_64
 	select HOTPLUG_PARALLEL			if SMP && X86_64
diff --git a/arch/x86/include/asm/user_unwind.h b/arch/x86/include/asm/user_unwind.h
new file mode 100644
index 000000000000..8c509c65cfb5
--- /dev/null
+++ b/arch/x86/include/asm/user_unwind.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_USER_UNWIND_H
+#define _ASM_X86_USER_UNWIND_H
+
+#define ARCH_INIT_USER_FP_FRAME							\
+	.ra_off		= (s32)sizeof(long) * -1,				\
+	.cfa_off	= (s32)sizeof(long) * 2,				\
+	.fp_off		= (s32)sizeof(long) * -2,				\
+	.use_fp		= true,
+
+#endif /* _ASM_X86_USER_UNWIND_H */
-- 
2.46.0