linux-kernel - [PATCH v7 03/17] unwind_user/x86: Enable frame pointer unwinding on x86

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Message-ID: <20250502165007.885738514@goodmis.org>
Date: Fri, 02 May 2025 12:47:49 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Josh Poimboeuf <jpoimboe@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>,
 x86@...nel.org,
 Jiri Olsa <jolsa@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH v7 03/17] unwind_user/x86: Enable frame pointer unwinding on x86

From: Josh Poimboeuf <jpoimboe@...nel.org>

Use ARCH_INIT_USER_FP_FRAME to describe how frame pointers are unwound
on x86, and enable CONFIG_HAVE_UNWIND_USER_FP accordingly so the
unwind_user interfaces can be used.

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

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4c33c644b92d..a6e529dc4550 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -301,6 +301,7 @@ config X86
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_UACCESS_VALIDATION		if HAVE_OBJTOOL
 	select HAVE_UNSTABLE_SCHED_CLOCK
+	select HAVE_UNWIND_USER_FP		if X86_64
 	select HAVE_USER_RETURN_NOTIFIER
 	select HAVE_GENERIC_VDSO
 	select VDSO_GETRANDOM			if X86_64
diff --git a/arch/x86/include/asm/unwind_user.h b/arch/x86/include/asm/unwind_user.h
new file mode 100644
index 000000000000..8597857bf896
--- /dev/null
+++ b/arch/x86/include/asm/unwind_user.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_UNWIND_USER_H
+#define _ASM_X86_UNWIND_USER_H
+
+#define ARCH_INIT_USER_FP_FRAME							\
+	.cfa_off	= (s32)sizeof(long) *  2,				\
+	.ra_off		= (s32)sizeof(long) * -1,				\
+	.fp_off		= (s32)sizeof(long) * -2,				\
+	.use_fp		= true,
+
+#endif /* _ASM_X86_UNWIND_USER_H */
-- 
2.47.2