linux-kernel - [tip:x86/asm] x86-64: move save

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Message-ID: <tip-c2810188c1b810c68139608a207befae0a4f1e69@git.kernel.org>
Date:	Thu, 12 Mar 2009 11:57:37 GMT
From:	Jan Beulich <jbeulich@...ell.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	jbeulich@...ell.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/asm] x86-64: move save_paranoid into .kprobes.text

Commit-ID:  c2810188c1b810c68139608a207befae0a4f1e69
Gitweb:     http://git.kernel.org/tip/c2810188c1b810c68139608a207befae0a4f1e69
Author:     "Jan Beulich" <jbeulich@...ell.com>
AuthorDate: Thu, 12 Mar 2009 10:38:55 +0000
Commit:     Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 12 Mar 2009 11:57:46 +0100

x86-64: move save_paranoid into .kprobes.text

Impact: mark save_paranoid as non-kprobe-able code

This appears to be necessary as the function gets called from
kprobes-unsafe exception handling stubs (i.e. which themselves
live in .kprobes.text).

Signed-off-by: Jan Beulich <jbeulich@...ell.com>
LKML-Reference: <49B8F44F.76E4.0078.0@...ell.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/kernel/entry_64.S |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 54866bb..a331ec3 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -368,6 +368,7 @@ ENTRY(save_rest)
 END(save_rest)
 
 /* save complete stack frame */
+	.pushsection .kprobes.text, "ax"
 ENTRY(save_paranoid)
 	XCPT_FRAME 1 RDI+8
 	cld
@@ -396,6 +397,7 @@ ENTRY(save_paranoid)
 1:	ret
 	CFI_ENDPROC
 END(save_paranoid)
+	.popsection
 
 /*
  * A newly forked process directly context switches into this address.
--
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