linux-kernel - [tip:x86/debug] x86/asm/power: Create stack frames in hibernate_asm

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Message-ID: <tip-6f9e5b9ab3161a77ed403af8d7a9ab0a7bab1c88@git.kernel.org>
Date:	Tue, 23 Feb 2016 01:01:50 -0800
From:	tip-bot for Josh Poimboeuf <tipbot@...or.com>@zytor.com
To:	linux-tip-commits@...r.kernel.org@...or.com
Cc:	bp@...en8.de, tglx@...utronix.de, torvalds@...ux-foundation.org,
	palves@...hat.com, jpoimboe@...hat.com, bp@...e.de,
	luto@...capital.net, rafael.j.wysocki@...el.com, hpa@...or.com,
	mingo@...nel.org, brgerst@...il.com, luto@...nel.org, pavel@....cz,
	namhyung@...il.com, jslaby@...e.cz, chris.j.arges@...onical.com,
	peterz@...radead.org, bernd@...rovitsch.priv.at,
	dvlasenk@...hat.com, linux-kernel@...r.kernel.org, mmarek@...e.cz,
	acme@...nel.org, akpm@...ux-foundation.org
Subject: [tip:x86/debug] x86/asm/power: Create stack frames in hibernate_asm_64.S

Commit-ID:  6f9e5b9ab3161a77ed403af8d7a9ab0a7bab1c88
Gitweb:     http://git.kernel.org/tip/6f9e5b9ab3161a77ed403af8d7a9ab0a7bab1c88
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Thu, 21 Jan 2016 16:49:24 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 23 Feb 2016 09:03:58 +0100

x86/asm/power: Create stack frames in hibernate_asm_64.S

swsusp_arch_suspend() and restore_registers() are callable non-leaf
functions which don't honor CONFIG_FRAME_POINTER, which can result in
bad stack traces.  Also they aren't annotated as ELF callable functions
which can confuse tooling.

Create a stack frame for them when CONFIG_FRAME_POINTER is enabled and
give them proper ELF function annotations.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Reviewed-by: Borislav Petkov <bp@...e.de>
Acked-by: Pavel Machek <pavel@....cz>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Bernd Petrovitsch <bernd@...rovitsch.priv.at>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Chris J Arges <chris.j.arges@...onical.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Jiri Slaby <jslaby@...e.cz>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michal Marek <mmarek@...e.cz>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Pedro Alves <palves@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: live-patching@...r.kernel.org
Link: http://lkml.kernel.org/r/bdad00205897dc707aebe9e9e39757085e2bf999.1453405861.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/power/hibernate_asm_64.S | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/power/hibernate_asm_64.S b/arch/x86/power/hibernate_asm_64.S
index e2386cb..4400a43 100644
--- a/arch/x86/power/hibernate_asm_64.S
+++ b/arch/x86/power/hibernate_asm_64.S
@@ -21,8 +21,10 @@
 #include <asm/page_types.h>
 #include <asm/asm-offsets.h>
 #include <asm/processor-flags.h>
+#include <asm/frame.h>
 
 ENTRY(swsusp_arch_suspend)
+	FRAME_BEGIN
 	movq	$saved_context, %rax
 	movq	%rsp, pt_regs_sp(%rax)
 	movq	%rbp, pt_regs_bp(%rax)
@@ -50,7 +52,9 @@ ENTRY(swsusp_arch_suspend)
 	movq	%rax, restore_cr3(%rip)
 
 	call swsusp_save
+	FRAME_END
 	ret
+ENDPROC(swsusp_arch_suspend)
 
 ENTRY(restore_image)
 	/* switch to temporary page tables */
@@ -107,6 +111,7 @@ ENTRY(core_restore_code)
 	 */
 
 ENTRY(restore_registers)
+	FRAME_BEGIN
 	/* go back to the original page tables */
 	movq    %rbx, %cr3
 
@@ -147,4 +152,6 @@ ENTRY(restore_registers)
 	/* tell the hibernation core that we've just restored the memory */
 	movq	%rax, in_suspend(%rip)
 
+	FRAME_END
 	ret
+ENDPROC(restore_registers)