linux-kernel - [PATCH 5/5] x86: signal: introduce helper align

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Date:	Fri, 27 Feb 2009 10:30:32 -0800
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] x86: signal: introduce helper align_sigframe()

From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>

Impact: cleanup

Introduce helper align_sigframe() to align stack pointer for signal frame.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
---
 arch/x86/kernel/signal.c |   27 +++++++++++++++------------
 1 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 83212e3..ceeb466 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -191,6 +191,20 @@ setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
 /*
  * Determine which stack to use..
  */
+static unsigned long align_sigframe(unsigned long sp)
+{
+#ifdef CONFIG_X86_32
+	/*
+	 * Align the stack pointer according to the i386 ABI,
+	 * i.e. so that on function entry ((sp + 4) & 15) == 0.
+	 */
+	sp = ((sp + 4) & -16ul) - 4;
+#else /* !CONFIG_X86_32 */
+	sp = round_down(sp, 16) - 8;
+#endif
+	return sp;
+}
+
 static inline void __user *
 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
 	     void __user **fpstate)
@@ -236,18 +250,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
 			return (void __user *)-1L;
 	}
 
-	sp -= frame_size;
-#ifdef CONFIG_X86_32
-	/*
-	 * Align the stack pointer according to the i386 ABI,
-	 * i.e. so that on function entry ((sp + 4) & 15) == 0.
-	 */
-	sp = ((sp + 4) & -16ul) - 4;
-#else /* !CONFIG_X86_32 */
-	sp = round_down(sp, 16) - 8;
-#endif
-
-	return (void __user *) sp;
+	return (void __user *)align_sigframe(sp - frame_size);
 }
 
 #ifdef CONFIG_X86_32
-- 
1.6.1.2

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