linux-kernel - [PATCH v5 07/12] unwind_user/sframe: Wire up unwind

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Message-ID: <20250424201824.638379190@goodmis.org>
Date: Thu, 24 Apr 2025 16:15:18 -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>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Josh Poimboeuf <jpoimboe@...nel.org>,
 x86@...nel.org,
 Peter Zijlstra <peterz@...radead.org>,
 Ingo Molnar <mingo@...nel.org>,
 Arnaldo Carvalho de Melo <acme@...nel.org>,
 Indu Bhagat <indu.bhagat@...cle.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>,
 Andrii Nakryiko <andrii.nakryiko@...il.com>,
 Jens Remus <jremus@...ux.ibm.com>,
 Florian Weimer <fweimer@...hat.com>,
 Andy Lutomirski <luto@...nel.org>,
 Weinan Liu <wnliu@...gle.com>,
 Blake Jones <blakejones@...gle.com>,
 Beau Belgrave <beaub@...ux.microsoft.com>,
 "Jose E. Marchesi" <jemarch@....org>,
 Alexander Aring <aahringo@...hat.com>
Subject: [PATCH v5 07/12] unwind_user/sframe: Wire up unwind_user to sframe

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

Now that the sframe infrastructure is fully in place, make it work by
hooking it up to the unwind_user interface.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 arch/Kconfig                      |  1 +
 include/linux/unwind_user_types.h |  1 +
 kernel/unwind/user.c              | 22 +++++++++++++++++++---
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 5d7946e9a900..9ba467006774 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -448,6 +448,7 @@ config HAVE_UNWIND_USER_COMPAT_FP

 config HAVE_UNWIND_USER_SFRAME
 	bool
+	select UNWIND_USER

 config HAVE_PERF_CALLCHAIN_DEFERRED
 	bool
diff --git a/include/linux/unwind_user_types.h b/include/linux/unwind_user_types.h
index 3ec4a097a3dd..5558558948b7 100644
--- a/include/linux/unwind_user_types.h
+++ b/include/linux/unwind_user_types.h
@@ -9,6 +9,7 @@ enum unwind_user_type {
 	UNWIND_USER_TYPE_NONE,
 	UNWIND_USER_TYPE_FP,
 	UNWIND_USER_TYPE_COMPAT_FP,
+	UNWIND_USER_TYPE_SFRAME,
 };

 struct unwind_stacktrace {
diff --git a/kernel/unwind/user.c b/kernel/unwind/user.c
index 92963f129c6a..fc0c75da81f6 100644
--- a/kernel/unwind/user.c
+++ b/kernel/unwind/user.c
@@ -6,6 +6,7 @@
 #include <linux/sched.h>
 #include <linux/sched/task_stack.h>
 #include <linux/unwind_user.h>
+#include <linux/sframe.h>
 #include <linux/uaccess.h>
 #include <asm/unwind_user.h>

@@ -29,6 +30,12 @@ static inline bool compat_state(struct unwind_user_state *state)
 	       state->type == UNWIND_USER_TYPE_COMPAT_FP;
 }

+static inline bool sframe_state(struct unwind_user_state *state)
+{
+	return IS_ENABLED(CONFIG_HAVE_UNWIND_USER_SFRAME) &&
+	       state->type == UNWIND_USER_TYPE_SFRAME;
+}
+
 #define UNWIND_GET_USER_LONG(to, from, state)				\
 ({									\
 	int __ret;							\
@@ -48,12 +55,19 @@ int unwind_user_next(struct unwind_user_state *state)
 	if (state->done)
 		return -EINVAL;

-	if (compat_state(state))
+	if (compat_state(state)) {
 		frame = &compat_fp_frame;
-	else if (fp_state(state))
+	} else if (sframe_state(state)) {
+		if (sframe_find(state->ip, frame)) {
+			if (!IS_ENABLED(CONFIG_HAVE_UNWIND_USER_FP))
+				goto the_end;
+			frame = &fp_frame;
+		}
+	} else if (fp_state(state)) {
 		frame = &fp_frame;
-	else
+	} else {
 		goto the_end;
+	}

 	cfa = (frame->use_fp ? state->fp : state->sp) + frame->cfa_off;

@@ -94,6 +108,8 @@ int unwind_user_start(struct unwind_user_state *state)

 	if (IS_ENABLED(CONFIG_HAVE_UNWIND_USER_COMPAT_FP) && in_compat_mode(regs))
 		state->type = UNWIND_USER_TYPE_COMPAT_FP;
+	else if (current_has_sframe())
+		state->type = UNWIND_USER_TYPE_SFRAME;
 	else if (IS_ENABLED(CONFIG_HAVE_UNWIND_USER_FP))
 		state->type = UNWIND_USER_TYPE_FP;
 	else
-- 
2.47.2