linux-kernel - [PATCH RFC 07/10] unwind/x86: Add HAVE_USER

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Message-ID: <28efef61435d2fbb42bf26277adae0c630e05cf4.1699487758.git.jpoimboe@kernel.org>
Date:   Wed,  8 Nov 2023 16:41:12 -0800
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.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
Subject: [PATCH RFC 07/10] 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 cacf11ac4b10..95939cd54dfe 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -278,6 +278,7 @@ 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 HOTPLUG_PARALLEL			if SMP && X86_64
 	select HOTPLUG_SMT			if SMP
diff --git a/arch/x86/include/asm/user_unwind.h b/arch/x86/include/asm/user_unwind.h
new file mode 100644
index 000000000000..caa6266abbb4
--- /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		= sizeof(long) * -1,				\
+	.cfa_off	= sizeof(long) * 2,				\
+	.fp_off		= sizeof(long) * -2,				\
+	.use_fp		= true,
+
+#endif /* _ASM_X86_USER_UNWIND_H */
-- 
2.41.0