linux-kernel - [RFC PATCH 19/21] x86/asm: Fix frame pointer usage in rwsem functions

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Message-Id: <4ed7053d43f5d4696292ba6484d40951e479adc3.1437150175.git.jpoimboe@redhat.com>
Date:	Fri, 17 Jul 2015 11:47:35 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>, x86@...nel.org,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 19/21] x86/asm: Fix frame pointer usage in rwsem functions

rwsem.S has several callable non-leaf functions which don't honor
CONFIG_FRAME_POINTER, which can result in bad stack traces.

Create stack frames for them when CONFIG_FRAME_POINTER is enabled.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 arch/x86/lib/rwsem.S | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/x86/lib/rwsem.S b/arch/x86/lib/rwsem.S
index 40027db..332e533 100644
--- a/arch/x86/lib/rwsem.S
+++ b/arch/x86/lib/rwsem.S
@@ -15,6 +15,7 @@
 
 #include <linux/linkage.h>
 #include <asm/alternative-asm.h>
+#include <asm/frame.h>
 
 #define __ASM_HALF_REG(reg)	__ASM_SEL(reg, e##reg)
 #define __ASM_HALF_SIZE(inst)	__ASM_SEL(inst##w, inst##l)
@@ -84,24 +85,29 @@
 
 /* Fix up special calling conventions */
 ENTRY(call_rwsem_down_read_failed)
+	FRAME
 	save_common_regs
 	__ASM_SIZE(push,) %__ASM_REG(dx)
 	movq %rax,%rdi
 	call rwsem_down_read_failed
 	__ASM_SIZE(pop,) %__ASM_REG(dx)
 	restore_common_regs
+	ENDFRAME
 	ret
 ENDPROC(call_rwsem_down_read_failed)
 
 ENTRY(call_rwsem_down_write_failed)
+	FRAME
 	save_common_regs
 	movq %rax,%rdi
 	call rwsem_down_write_failed
 	restore_common_regs
+	ENDFRAME
 	ret
 ENDPROC(call_rwsem_down_write_failed)
 
 ENTRY(call_rwsem_wake)
+	FRAME
 	/* do nothing if still outstanding active readers */
 	__ASM_HALF_SIZE(dec) %__ASM_HALF_REG(dx)
 	jnz 1f
@@ -109,15 +115,18 @@ ENTRY(call_rwsem_wake)
 	movq %rax,%rdi
 	call rwsem_wake
 	restore_common_regs
-1:	ret
+1:	ENDFRAME
+	ret
 ENDPROC(call_rwsem_wake)
 
 ENTRY(call_rwsem_downgrade_wake)
+	FRAME
 	save_common_regs
 	__ASM_SIZE(push,) %__ASM_REG(dx)
 	movq %rax,%rdi
 	call rwsem_downgrade_wake
 	__ASM_SIZE(pop,) %__ASM_REG(dx)
 	restore_common_regs
+	ENDFRAME
 	ret
 ENDPROC(call_rwsem_downgrade_wake)
-- 
2.1.0

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