Commit 1fae0279 authored by Hiroshi Shimamoto's avatar Hiroshi Shimamoto Committed by Ingo Molnar
Browse files

x86: signal: introduce helper align_sigframe() 



Impact: cleanup

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

Signed-off-by: default avatarHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 75779f05

arch/x86/kernel/signal.c

+15 −12
Original line number Diff line number Diff line
@@ -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