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Message-ID: <20260127150554.2760964-18-jremus@linux.ibm.com>
Date: Tue, 27 Jan 2026 16:05:52 +0100
From: Jens Remus <jremus@...ux.ibm.com>
To: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
bpf@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
Steven Rostedt <rostedt@...nel.org>
Cc: Jens Remus <jremus@...ux.ibm.com>, Josh Poimboeuf <jpoimboe@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>,
Jiri Olsa <jolsa@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Andrii Nakryiko <andrii@...nel.org>,
Indu Bhagat <indu.bhagat@...cle.com>,
"Jose E. Marchesi" <jemarch@....org>,
Beau Belgrave <beaub@...ux.microsoft.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Florian Weimer <fweimer@...hat.com>, Kees Cook <kees@...nel.org>,
"Carlos O'Donell" <codonell@...hat.com>, Sam James <sam@...too.org>,
Dylan Hatch <dylanbhatch@...gle.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
David Hildenbrand <david@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
"Liam R. Howlett" <Liam.Howlett@...cle.com>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
Michal Hocko <mhocko@...e.com>, Mike Rapoport <rppt@...nel.org>,
Suren Baghdasaryan <surenb@...gle.com>,
Vlastimil Babka <vbabka@...e.cz>, Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
"Steven Rostedt (Google)" <rostedt@...dmis.org>
Subject: [PATCH v13 17/18] unwind_user/sframe/x86: Enable sframe unwinding on x86
From: Josh Poimboeuf <jpoimboe@...nel.org>
The x86 SFrame V3 implementation works fairly well, starting with
binutils 2.46. Enable it.
[ Jens Remus: Reword commit message for SFrame V3, starting with
binutils 2.46. ]
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Indu Bhagat <indu.bhagat@...cle.com>
Cc: "Jose E. Marchesi" <jemarch@....org>
Cc: Beau Belgrave <beaub@...ux.microsoft.com>
Cc: Jens Remus <jremus@...ux.ibm.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Florian Weimer <fweimer@...hat.com>
Cc: Sam James <sam@...too.org>
Cc: Kees Cook <kees@...nel.org>
Cc: "Carlos O'Donell" <codonell@...hat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
Signed-off-by: Jens Remus <jremus@...ux.ibm.com>
---
Notes (jremus):
Changes in v13:
- Naive implementation of unwind_user_get_reg() to support SFrame V3
flexible FDEs (e.g. used to represent DRAP pattern).
- Define SFRAME_REG_SP and SFRAME_REG_FP to the respective x86-64
DWARF register numbers.
- Reword commit message for SFrame V3 and (upcoming) binutils 2.46.
arch/x86/Kconfig | 1 +
arch/x86/include/asm/unwind_user.h | 34 +++++++++++++++++++++++
arch/x86/include/asm/unwind_user_sframe.h | 12 ++++++++
3 files changed, 47 insertions(+)
create mode 100644 arch/x86/include/asm/unwind_user_sframe.h
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 80527299f859..195cb99a590c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -301,6 +301,7 @@ config X86
select HAVE_UACCESS_VALIDATION if HAVE_OBJTOOL
select HAVE_UNSTABLE_SCHED_CLOCK
select HAVE_UNWIND_USER_FP if X86_64
+ select HAVE_UNWIND_USER_SFRAME 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
index f38f7c5ff1de..ae46906c3b39 100644
--- a/arch/x86/include/asm/unwind_user.h
+++ b/arch/x86/include/asm/unwind_user.h
@@ -15,6 +15,40 @@ static inline int unwind_user_word_size(struct pt_regs *regs)
return user_64bit_mode(regs) ? 8 : 4;
}
+static inline int unwind_user_get_reg(unsigned long *val, unsigned int regnum)
+{
+#ifdef CONFIG_X86_64
+ const struct pt_regs *regs = task_pt_regs(current);
+
+ switch (regnum) {
+ /* DWARF register numbers 0..15 */
+ case 0: *val = regs->ax; break;
+ case 1: *val = regs->dx; break;
+ case 2: *val = regs->cx; break;
+ case 3: *val = regs->bx; break;
+ case 4: *val = regs->si; break;
+ case 5: *val = regs->di; break;
+ case 6: *val = regs->bp; break;
+ case 7: *val = regs->sp; break;
+ case 8: *val = regs->r8; break;
+ case 9: *val = regs->r9; break;
+ case 10: *val = regs->r10; break;
+ case 11: *val = regs->r11; break;
+ case 12: *val = regs->r12; break;
+ case 13: *val = regs->r13; break;
+ case 14: *val = regs->r14; break;
+ case 15: *val = regs->r15; break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+#else /* !CONFIG_X86_64 */
+ return -EINVAL;
+#endif /* !CONFIG_X86_64 */
+
+}
+#define unwind_user_get_reg unwind_user_get_reg
+
#endif /* CONFIG_UNWIND_USER */
#ifdef CONFIG_HAVE_UNWIND_USER_FP
diff --git a/arch/x86/include/asm/unwind_user_sframe.h b/arch/x86/include/asm/unwind_user_sframe.h
new file mode 100644
index 000000000000..d828ae1a4aac
--- /dev/null
+++ b/arch/x86/include/asm/unwind_user_sframe.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_UNWIND_USER_SFRAME_H
+#define _ASM_X86_UNWIND_USER_SFRAME_H
+
+#ifdef CONFIG_X86_64
+
+#define SFRAME_REG_SP 7
+#define SFRAME_REG_FP 6
+
+#endif
+
+#endif /* _ASM_X86_UNWIND_USER_SFRAME_H */
--
2.51.0
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